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PUZZLE OF THE DAY (17th Feb, 08)
Two boys sell apples. Each sells thirty apples a day. The first boy sells his apples at two for five rupees (and therefore earns Rs 75 per day). The second boy sells his apples at three for five rupees (and therefore earns Rs 50 per day). The total received by both boys each day is therefore Rs 125.
One day, the first boy is sick, and the second boy takes over his apple selling duties. To accommodate the differing rates, the boy sells the sixty apples at five for Rs 10. But selling sixty apples at five for Rs 10 yields only Rs 120 earnings at the end of the day. What happened to the other 5 rupees?
Old Puzzles
15th Feb
While a red mark was placed on the forehead of each of three blindfolded women seated facing each other in a circle, they were told that the mark might be either red or white. Upon removal of the blindfolds, each was to raise her hand if she saw at least one red mark, and then to take it down if she could logically deduce the color of her own mark. All three hands were quickly raised, but then one of them lowered her hand. How did she know?
14th Feb
Potatoes are made up of 99% water and 1% "potato matter." Chaitu bought 100 pounds of potatoes and left them outside in the sun for a while. When he returned, he discovered that the potatoes had dehydrated and were now only made up of 98% water. How much did the potatoes now weigh?
13th Feb
If a boy and a half can eat a hot dog and a half in a minute and a half, how many hot dogs can six boys eat in six minutes?
12th Feb
An explorer wishes to cross a barren desert that requires 6 days to cross, but one man can only carry enough food for 4 days. What is the fewest number of other men required to help carry enough food for him to cross, the constraint is that each man should survive?
11th Feb
Grass grows in a field at some rate r, where r is the units of grass grown per day. It is known that if 10 sheep are turned out in the field, the grass will be gone in 20 days. On the other hand, if 15 sheep are turned out in the field, the grass will be gone in 10 days. If 25 sheep are turned out in the field, when will the grass be gone?
For solution email to vijay@infopointindia.com.