What age is a man in his fifth prime?

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You need to buy exactly 100 animals with exactly $100. Cows are $10 apiece, pigs are $3 apiece and ducks are $.50 apiece. How many of each can you buy with exactly $100?

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There is a certain family with both girl and boy children. Each of the boys has the same number of brothers as he has sisters. Each of the girls has twice as many brothers as she has sisters. How many …

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A snail is at the bottom of a 20 meters deep pit. Every day the snail climbs 5 meters upwards, but at night it slides 4 meters back downwards. How many days does it take before the snail reaches the …

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What counts the days of the night, strikes people, fades away cities, but can be torn down like paper?

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You must cut a birthday cake into exactly eight pieces, but you’re only allowed to make three straight cuts, and you can’t move pieces of the cake as you cut. How can you do it?

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What number is desired at the end but hated at the beginning?

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Divide 30 by 1/2 and add ten. What is the answer?

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Earth weighs 1,000,000 tons and the people on Earth make a wall that weighs 1 ton. How much does Earth weigh now?

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Farmer Brown came to town with some watermelons. He sold half of them plus half a melon and found that he had one whole melon left. How many melons did he take to town?

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