I have 4 children. The youngest is half the age of the second, who is half the age of the third, who is half the age of the oldest. If the sum of their ages is 45, how old is the oldest child?
24
Let youngest be x. Ages are x, 2x, 4x, 8x. Sum = 15x = 45 -> x = 3. Oldest is 8x = 24.
About this riddle
Math riddles hide a calculation inside a short story. Pull out the numbers, work out what is being asked, and watch for a trick such as a unit change.
Difficulty: Medium. More like this: Math riddles with answers or try Target 24 for a different kind of puzzle.
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