We all come across many mathematical or numerical puzzles, which are based on the usage of mathematical symbols or notations. At times such puzzles can even be solved by changing the way things are written.
In this post I am presenting 3 such interesting puzzles. Keen observation and simple application of logic is required to solve them. So here you go -
- Make this equation valid with single stroke of pen (i.e. just by adding a line somewhere): 5+5+5 = 550
- Make 120 using 5 zeros. You can use any mathematical notation/symbol
- What mathematical symbol can be put between 5 and 9, to get a number bigger than 5 and smaller
Leave your answers as comment under this post.
Turn of the Century Puzzle
Your grandfather, determined to start the year 1900 off right, went to bed at 7 p.m. on December 31, 1899, setting his alarm clock to wake him at 8 the next morning. He slept like a log. How many hours sleep did he get?
Ancient Coin Puzzle
A thief went to a shop that sold antique coins. He stole a coin from Emperor Alexander’s time that had 326 B.C. inscribed on it. These rare coins were worth $ 100 for every year of their age (years from date of minting till now). So how much did the thief get for his stolen coin?
Both the puzzles above have some similarity. There is a clue hidden in the title of the post itself.
Missing Dollar Riddle
Three friends check into a hotel. They pay $30 to the manager and go to their room. The manager suddenly remembers that the room rate is $25 and gives $5 to the bellboy to return to the people. On the way to the room the bellboy reasons that $5 would be difficult to share among three people so he pockets $2 and gives $1 to each person. Now each person paid $10 and got back $1. So they paid £9 each, totalling $27. The bellboy has $2, totalling $29.
Timing Puzzles
Timing Puzzle 1
Having 2 sand-glasses: one 7-minute and the second one 4-minute. How can you time correctly 9 minutes ?
Another logical reasoning puzzle for you. The benefit of solving such logical puzzle is immense. It's always a good exercise for the brain. Moreover, it helps you in preparing for various competitive examinations.
During the latest round of a game, Kamal was fourth. Ramesh is not the oldest, but is older than Sujan, who was not second. The child who was next in age to the youngest, finished second. The child who finished in third place is older than the child who finished first. Bimal is younger than the child who finished in third place. Can you determine who finished where and place the children in order of age?
Leave your answers below -
Hey friends, try and solve this intricate puzzle. You can use your skills to explain this puzzle using a flow chart. If you make one send it to me on my email address, I will include it in the body of this post itself.
You are the ruler of a medieval empire and you are about to have a celebration tomorrow. The celebration is the most important party you have ever hosted. You've got 1000 bottles of wine you were planning to open for the celebration, but you find out that one of them is poisoned. The poison exhibits no symptoms until death. Death occurs within ten to twenty hours after consuming even the minutest amount of poison. You have over a thousand slaves at your disposal and just under 24 hours to determine which single bottle is poisoned. You have a handful of prisoners about to be executed, and it would mar your celebration to have anyone else killed. What is the smallest number of prisoners you must have to drink from the bottles to be absolutely sure to find the poisoned bottle within 24 hours?
Friends based on the emails I am getting I think most of you like creative and interesting logical puzzles. So I am presenting another very interesting grid puzzle one for you.
Grid Puzzle
Below is a very special grid, around each shaded number are 8 white squares. However, each white square should have a number from 1 to 7. Once filled in, these 8 numbers will sum to the shaded number. In addition, once completed correctly, no row nor column will contain a duplicate number within a white square. For example, the top row may be 5 6 4 2 3 1 7, etc. hence no digit repeated (similar to Sudoko)
Try to fill all the blank spaces. Leave your answers below by writing the numbers row-wise.
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Answer (posted on September 17, 2010)
Teasing Brain Teaser!!
I met Sweety first time in a marriage party in Kolkata. We exchanged our phone numbers and decided to meet each other soon. When she rang up and invited me to her house, she decided to tease me.
This is how she gave me the number of her house on a particular street:
“I live in a long street. Numbered one the one side of my house are the houses one, two, three and so on. All the numbers on one side of my house add up to exactly the same as all the numbers on the other side of my house. I know
Once upon a time, and old lady went to sell her vast quantity of eggs at the local market.
When asked how many she had, she replied:
Son, I can't count past 100 but I know that.
If you divide the number of eggs by 2 there will be one egg left.
If you divide the number of eggs by 3 there will be one egg left.
If you divide the number of eggs by 4 there will be one egg left.
If you divide the number of eggs by 5 there will be one egg left.
If you divide the number of eggs by 6 there will be one egg left.
If you divide the number of eggs by 7 there will be one egg left.
If you divide the number of eggs by 8 there will be one egg left.
If you divide the number of eggs by 9 there will be one egg left.
If you divide the number of eggs by 10 there will be one egg left.
Finally. If you divide the Number of eggs by 11 there will be NO EGGS left!
How many eggs did the old lady have?
watchman was paid for awaking not for sleeping so that he can see dreams.. – 05Feb12
as a night watchman he shouldnt have slept at night to get that dream... – 04Feb12
Can u plz give me clarity in ur solution Kaush sir..... – 04Feb12
thanks for these tricks. Are these from the book "quicker maths by m.tyra" ? – 03Feb12