If you take my age, multiply it by 5, subtract 10, and then divide by 2, you get 30. How old am I?
14
Work backwards from 30: Multiply by 2 to get 60, add 10 to get 70, divide by 5 to get 14.
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: Easy. More like this: Math riddles with answers or try Target 24 for a different kind of puzzle.
More math riddles
I am an integer. Cube me, and my value increases by 56. What integer am I?
A bag contains 3 red marbles and 2 blue marbles. Without looking, what is the minimum number of marbles you must draw to guarantee getting at least one red marble?
A bag contains red, blue, and green marbles. There are twice as many red marbles as blue ones, and half as many green marbles as blue ones. If there are 28 marbles in total, how many are blue?
What mathematical digit represents nothing on its own, but multiplying any integer by ten is as simple as placing me at the right end of it?
One firework costs 3 dollars. How many dollars do 3 fireworks cost?
I am an even two-digit number. Both of my digits are prime numbers, and my digits add up to a square number. What number am I?

