So You Think You Are Clever?

Here is quiz that is likely to engross you mentally for some time. Ponder on each one of them very carefully. At the end of it you might realize, how clever you are (or you are not). If you can answer 5 or more than that correct, I consider you exceptional.

  1. If 3 cats kill 3 rats in 3 minutes, how long will it take 100 cats to kill 100 rats?
  2. Is it legal for a man to marry his widow’s sister?
  3. A monkey is at the bottom of a 30-foot well. Each day he jumps up 3 feet and slips back two. At that rate when will the monkey reach the top of the well?
  4. I have 2 minutes to catch a train and 2 Km to go. If I go the first Km at the rate of 30 Km per hour, at what rate must I go the second Km in order to catch the train?
  5. The number of eggs in a basket doubles every minute. The basket is full of eggs in an hour. When was the basket hall full?
  6. What is the smallest number of ducks that could swim in this formation: two ducks in front of a duck, two ducks behind a duck and a duck between two ducks?
  7. A boat will carry only 200 pounds. How a man weighing 200 pounds and his two sons, each of whom weighs 100 pounds, use it to cross a river?

Leave your answers below as a comment.

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Vineet Patawari

Hi, I'm Vineet Patawari. I fell in love with numbers after being scared of them for quite some time. Now, I'm here to make you feel comfortable with numbers and help you get rid of Math Phobia!

31 thoughts to “So You Think You Are Clever?”

  1. 1. 3 minutes
    2. the man is dead so it is not possible
    3. 28 Days
    4. He already missed the train
    5. 59 minutes
    6. 5 Ducks
    7. Both sons sail across. One son returns with the boat and gets down. Father sails across with the boat. Other son returns with the boat. Both sons sail across again.

  2. 1.3
    2. yes
    3.he could get out after 30 days if he would be alive
    4.i don’t think so he could reach 6.three
    7.first step- his both sons should be sailed across.
    second step-the father should sail across.

  3. 1) 3 minutes
    2) The guy is dead, so he can’t marry
    3) The monkey will be dead after so much days without food and water. So It’ll never come out, unless someone takes out its dead body from the well, it’ll be there only.
    4) He’s on time.
    5) On the 59th minute.
    6) 3 Ducks
    7) 1st the two sons will go. One son comes back. The father goes to other side. The son on the other side comes with the boat. Both the sons reach the other side.

  4. Just saying, these are really easy.
    1. 3 minutes
    2. Can’t, he’s in hell.
    3. 28 days
    4.You’re already there. Get out your iPod or something to kill time.
    5. At 59 minutes.
    6. Three
    7. I got 2 different ways. First one, you start off with the 2 sons rowing across. Then, have one of them row it back. Next. have the fat dad go across. Then, have the son that is on the same side of the dad row back. Finally, have both sons row back. I have an explanation. S= son D=dad ~~~~~~~=river B=Boat
    SSD~B~~~~~~~
    D~~~~~~~B~SS
    SD~B~~~~~~~S
    S~~~~~~~B~DS
    SS~B~~~~~~~D
    ~~~~~~~B~SSD
    Second way: They started on opposite sides. 🙂
    Hope you like it!

  5. 1. 3min
    2. in case of legality, its legal to marry wife’s sister but he is dead so he can’t marry.
    4. for next 1 km speed = 60km/hr
    5. 30 min
    6. 5 ducks
    7. first both sons will sail then the father.

  6. 5. I dont think. there is not mention that how much eggs are in basket? the question is number of eggs……?

    1. 3 mins,
    2. He is dead already,,
    3. 28 days,,,
    4, all the time he has (2 mins) , will be consumed 2 reach the first km,,,,
    6. 3ducks,
    7. 1st son come back with boat to the man.
    Step3- 1st Son will leave the boat and man goes in the boat.
    Step4- There the man will leave the boat and 2nd son goes back to his brother with the boat.
    Step5- Both son cross the river in the boat and reach their father on the other end.

  7. 1. 3minutes
    3. 30 days
    4.90km/hr
    5. 59 minutes
    6. 3ducks
    7. both sons will cross the river & one him will return to his father, then his father will cross the river in the boat. then his another son will return to the shore & he will came with his sibling

  8. the correct answer for ques 7 is
    let sons be like son1,son2
    1.) both the sons will sit in boat and cross the river.
    2.)son2 will come back with the boat .And the father will seat all alone in the boat and leave whereas the son2 who come with the boat will be there.
    3.)when the father crosses river then the son1 will sit in the boat and again comeback with the boat.Son2 will sit with him and cross the river.
    Hence all three reached their Destination.

  9. 1. 3 mins,
    2. He is dead already,,
    3. 28 days,,,
    4, all the time he has (2 mins) , will be consumed 2 reach the first km,,,,
    5. 59 mins,,,,,
    6. 3ducks,
    7. 1st son come back with boat to the man.
    Step3- 1st Son will leave the boat and man goes in the boat.
    Step4- There the man will leave the boat and 2nd son goes back to his brother with the boat.
    Step5- Both son cross the river in the boat and reach their father on the other end.

  10. 1. 3 mins,
    2. He is dead already,,
    3. 28 days,,,
    4, all the time he has (2 mins) , will be consumed 2 reach the first km,,,,
    5. 59 mins,,,,,
    6. 4 ducks, because they have 2 move in formation,,,,,,
    7. same as Sandeep Baheti,,,,,,,

  11. 1. 3 mins,
    2. He is dead already,,
    3. 28 days,,;
    4, all the time he has (2 mins) , will be consumed 2 reach the first km,,,,
    5. 59 mins,,,,,
    6. 4 ducks, because they have 2 move in formation,,,,,,
    7. same as above,,,,,,,

  12. 1.3 mins,
    2. He is already dead,
    3. 28 days.
    4. Already 2mins are over in 1km.
    5. 59mins.
    6. three.
    7, Two sons sail first, then one son comes back and gets down, now father sails across and sends one son back and two sons sail together and cross.

  13. 1] 3 mins
    2] Cannot, as he is already dead
    3] 27 days
    4] I dont think this is possible on indian roads 🙂 answer is cannot. time over
    5] 59
    6] 2 😉
    7] The question is some wat confusing. Is that the boat can carry only 200 pounds? then in that case, answer is no.

  14. 1. 3 mins
    2. The man is already dead
    3. 28 days
    4. 90 km/Hour
    5. At 59th min
    6. 3
    7. Both sons sail across, then 1 son come back, then father sails across alone with the boat, other son return with the boat, then both the sons sail across again happily

  15. 1) 3 minutes
    2) no dead men
    3) 14
    4) 1 & 1/2 hour
    5) 59 minutes
    6) 3
    7)first two sons will go then one will come back get down , father will cross then other son will go back then two sons will cross together

  16. 1. 3 mins
    2. man is dead
    3. 27 days
    4. 2mins are over
    5.at 59 minutes
    6.three
    two sons will go. one son will come back.father will go and other son will bring the boat and two sons will go

  17. 1. 3 mins
    2. The man is already dead
    3. 28 days
    4. He has already consumed 2 mins for the 1st 1 km
    5. At 59 mins
    6. 3
    7. Both sons sail across, then 1 son come back, then father sails across alone with the boat, other son return with the boat, then both the sons sail across again happily

  18. 1.3 mins
    2.no.he is dead
    3.after a month
    4.90 km/hr
    5.59 mins
    6.3
    7.Both sons sail across. One son returns with the boat and gets down. Father sails across with the boat. Other son returns with the boat. Both sons sail across again.

  19. 1. 3 minutes
    2. the man is dead hence it is not possible
    3. 28 Days
    4. He already missed the train
    5. 59 minutes
    6. 3 Ducks
    7. Both sons sail across. One son returns with the boat and gets down. Father sails across with the boat. Other son returns with the boat. Both sons sail across again.

  20. 1– 3Minutes.
    2– The man must have died as his wife is widow. so he can not marry her sister.
    3– 28 days.
    4– Can not catch the train as 2 minutes were already been taken for the first kilometer.
    5– After 59 minutes.
    6– 3 Ducks.
    7– Step1- Both son will go.
    Step2- 1st son come back with boat to the man.
    Step3- 1st Son will leave the boat and man goes in the boat.
    Step4- There the man will leave the boat and 2nd son goes back to his brother with the boat.
    Step5- Both son cross the river in the boat and reach their father on the other end.

  21. 1. 3 minutes
    2. the man is dead hence it is not possible
    3. 28 Days
    4. He already missed the train
    5. 59 minutes
    6. 3 Ducks
    7. Both sons sail across. One son returns with the boat and gets down. Father sails across with the boat. Other son returns with the boat. Both sons sail across again.

  22. 1. 3 minutes
    2. the man is dead hence it is not possible
    3. 28 Days
    4. He already missed the train
    5. 59 minutes
    6. 3 Ducks
    7. Both sons sail across. One son returns with the boat and gets down. Father sails across with the boat. Other son returns with the boat. Both sons sail across again.

  23. a) 3 Minutes
    b) No . Dead men cannot marry
    c) 28th Day
    d) For crossing 1st k.m. you have already consumed 2 min.You will never be able to catch the train
    e) At 59 Minutes
    f) Minimum – 3
    g) First of all both his sons will sail across. One of them must get down and the other one goes back. The father then sails across. The other son comes back to pick his brother and both sail across .

  24. a) 3 Minutes
    b) No . Dead men cannot marry
    c) 27th Day
    d) For crossing 1st k.m. you have already consumed 2 min.You will never be able to catch the train
    e) At 59 Minutes
    f) Minimum – 3
    g) First of all both his sons will sail across. One of them must get down and the other one goes back. The father then sails across. The other son comes back to pick his brother and both sail across .

  25. a) 3 Minutes
    b) No . He is dead
    c) 28 Days
    d) He will never be able to catch
    e) At 59 Minutes the basket will be half full
    f) Minimum – 3
    g) First of all both his sons will sail across. One of them must get down and the other one goes back. The father then sails across. The other son comes back to pick his brother and both sail across .

  26. 1. 3 mins
    2. No. Dead men cannot marry.
    3. 28 days
    4. No matter at what speed you go, 2 minutes are already over
    5. At 59 mins
    6. Three
    7. Both sons sail across. One son returns with the boat and gets down. Father sails across with the boat. Other son returns with the boat. Both sons sail across again.

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