My father is four times as old as I am. In 20 years, he will only be twice as old as me. How old am I right now?
Ten years old
Let your age be x. Father is 4x. In 20 years: 4x + 20 = 2(x + 20). 4x + 20 = 2x + 40. 2x = 20, so x = 10.
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: Hard. More like this: Math riddles with answers or try Target 24 for a different kind of puzzle.
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