Three siblings share a birthday. The product of their ages is 72, and the sum of their ages is 14. If two of them are twins and there is a single eldest sibling, how old is the eldest?
8 years old
The factor set (3, 3, 8) multiplies to 72 (3 × 3 × 8) and sums to 14 (3 + 3 + 8 = 14). This accommodates two twin siblings aged 3 and one single eldest sibling aged 8.
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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