A van with all the windows closed contains some helium-filled balloons floating in it. When it starts accelerating what happens to the balloons?
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A barge with one man and a load of iron scrap is on a barge floating in a lock in the Panama Canal. If the man throws some iron off the barge into the water, what will happen to the water level on the side of the lock?
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Two fathers and two sons went fishing. Each caught exactly one fish and yet there were only three fishes caught. Why?
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A drawer contains 10 black and 10 brown socks that are all mixed up. What is the fewest number of socks you can take from the drawer without looking and be sure to get a pair of the same color?
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Unwarranted Assumptions
With data sufficiency problems, be careful not to read any more into a statement than what is given. The main purpose of some difficult problems is to lure you into making an unwarranted assumption.If you avoid the temptation, these problems can become routine.
Example: Did Incumbent I get over 50% of the vote?
(1) Challenger C got 49% of the vote.
(2) Incumbent I got 25,000 of the 100,000 votes cast.
Solution:
If you did not make any unwarranted assumptions, you probably did not find this to be a hard problem. What makes a problem difficult is not necessarily its underlying complexity; rather a problem is classified as difficult if many people miss it. A problem may be simple yet contain a psychological trap that causes people to answer it incorrectly. The above problem is difficult because many people subconsciously assume that there are only two candidates. They then figure that since the challenger received 49% of the vote the incumbent received 51% of the vote. This would be a valid deduction if C were the only challenger. But we cannot assume that. There may be two or more challengers. Hence, (1) is insufficient.
Now, consider (2) alone. Since Incumbent I received 25,000 of the 100,000 votes cast, I necessarily received 25% of the vote. Hence, the answer to the question is ‘No, the incumbent did not receive over 50% of the vote.’ Therefore, (2) is sufficient to answer the question. The answer is B.
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If one tyre of your car suddenly gets stolen.... and after sometime you find the Tyre without the screws how will you make your journey complete?
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You are a landscape designer and your boss asked u to design a landscape such that you should place 4 trees equidistance from each other (Distance from each tree to the other must be same). How will your do that?
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You have to draw 3 concentric circles with a line passing thru their center without lifting hand.
What is the height of room if after entering the room with a watch ur head strikes a hanging bulb?
Using 16 matches, set up this five-square formation. Now, by moving just two of the matches, from four square – each touching another – instead of five.
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