Infosys Interview Puzzles

Suppose that there is a rubber ball which has a property of bouncing back to the original height from which it was dropped and it keeps doing that until it is stopped by any external force.
Can you calculate the fraction of height to which the ball would have bounced if it has bounced four times after dropping from a certain height without being stopped?
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You had an infinite supply of water and a 5 ml and 3 ml gallons.
How would you measure exactly 4 ml in least number of steps ?
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Can you arrange the following figures in two groups of four figures each so that each group shall add to the same sum?
1 2 3 4 5 7 8 9
If you were allowed to reverse the 9 so as to change it into the missing 6 it would be very easy. For example, 1,2,7,8 and 3, 4,5,6 add up to 18 in both cases. But you are not allowed to make any such reversal.View SolutionSubmit Solution 1,240.6K views
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A pudding, when put into one of the pans of these scales, appeared to weigh four ounces more than nine elevenths of its true weight, but when put into the other pan it appeared to weigh three pounds more than in the first pan. What was its true weight?
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Here is an ancient puzzle that has always perplexed some people. Two market women were selling their apples, one at three for a penny and the other at two for a penny. One day they were both called away when each had thirty apples unsold: these they handed to a friend to sell at five for 2¢. It will be seen that if they had sold their apples separately they would have fetched 25¢, but when they were sold together they fetched only 24¢.
“Now,” people ask, “what in the world has become of that missing penny?” because, it is said, three for l¢ and two for l¢ is surely exactly the same as five for 2¢.
Can you explain the little mystery?View SolutionSubmit Solution 1,243.8K views
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A grocer in a small business had managed to put aside (apart from his legitimate profits) little sum in dollar bills, half dollars, and quarters, which he kept in eight bags, there being the same number of dollar bills and of each kind of coin in every bag. One night he decided to put the money into only seven bags, again with the same number of each kind of currency in every bag. And the following night he further reduced the number of bags to six, again putting the same number of each kind of currency in every bag. The next night the poor demented miser tried to do the same with five bags, but after hours of trial he utterly failed, had a fit, and died, greatly respected by his neighbors. What is the smallest possible amount of money he had put aside?
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Nine persons in a party, A, B, C, D, E, F, G, H, K, did as follows: First A gave each of the others as much money as he (the receiver) already held; then B did the same; then C; and so on to the last, K giving to each of the other eight persons the amount the receiver then held. Then it was found that each of the nine persons held the same amount. Can you find the smallest amount in cents that each person could
have originally held?View SolutionSubmit Solution 1,243.5K views
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A man went into a bank with a thousand dollars, all in dollar bills, and ten
bags. He said, “Place this money, please, in the bags in such a way that if I
call and ask for a certain number of dollars you can hand me over one
or more bags, giving me the exact amount called for without opening any of
the bags.”
How was it to be done? We are, of course, only concerned with a single
application, but he may ask for any exact number of dollars from one to one
thousand.View SolutionSubmit Solution 1,241.8K views
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A man went into a bank to cash a check. In handing over the money the
cashier, by mistake, gave him dollars for cents and cents for dollars. He
pocketed the money without examining it, and spent a nickel on his way home.
He then found that he possessed exactly twice the amount of the check. He
had no money in his pocket before going to the bank. What was the exact
amount of that check?View SolutionSubmit Solution 1,241.7K views
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There are n bulbs in a circle, each bulb has one switch associated with it, on operating the switch, it toggles the state of the corresponding bulb as well as two bulbs adjacent to that one. Given all bulbs are in off state initially, Give a situation when we can turn on all the bulbs.
Note: Number of bulbs are more then 1 i.e N>1
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