Math Riddles

The best math riddles out there can be found on Riddles For Us.

Water balloons

Robert and David were preparing to have a water balloon fight. "No Fair" cried Robert, "You have 3 times as many as I do!" David said "Fine!" and gave Robert 10 more balloons. "Still not fair!" argued Robert, "You still have twice as many as I do." How many more balloons must David give Robert for them to have the same number?

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Average: 9 (2 votes)
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Hos old?

When asked how old she was, Suzie replied, "In two years I will be twice as old as I was five years ago." How old is she?

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Average: 9 (1 vote)
Kind of riddle

Apple harvest

Mrs. Jones was very proud of her apple tree. One autumn, after harvesting her apples, she called her three sons together. "Here are 150 apples," she said. "I want you to take them to the market tomorrow and sell them for me." She gave Paul 15 apples, Nick 50, and Ben 85. "Your job," added Mrs. Jones, "is to sell the apples in such a way that each of you brings home the same amount of money." How do they do it?

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Average: 8.5 (2 votes)

Four pieces

A man had a bar of lead that weighed 40 lbs., and he divided it into four pieces in such a way as to allow him to weigh any number of pounds from one to forty. What are the weights of the four pieces?

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Average: 8 (1 vote)
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Melons

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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Average: 8 (1 vote)
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Inheritance

Old Granny Adams left half her money to her granddaughter and half that amount to her grandson. She left a sixth to her brother, and the remainder, $1,000, to the dogs’ home. How much did she leave altogether?

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Average: 8 (1 vote)

Lunch money

John noticed that the amount he was paying for his lunch was a rearrangement of the digits of the amount of money he had in his pocket, and that the money he had left over was yet another rearrangement of the same three digits! How much money did John start with?

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Average: 8 (1 vote)
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Seven times

What is the smallest whole number that is equal to seven times the sum of its digits?

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Average: 8 (1 vote)