Puzzles & Quizzes

Can You Solve the Number of Kids Logic Puzzle?

This logic puzzle by Presh Talwalkar of the MindYourDecisions YouTube channel requires some algebra. Scroll down to read the puzzle, and keep scrolling for the answer (and for even more logic puzzles).

Here's the Puzzle

The average age of a family — made up of two parents with kids — is 20. If you exclude one parent, who is 40, the average age drops to 15. How many kids are in the family? Scroll down to read the answer, and watch the video below to see how it's worked out.

Can You Solve the Number of Children Riddle?

Here's the Solution

There are two parents and three kids in this family. Did you solve the puzzle? Watch the video above to see how algebra was used to get to the answer. Keep the logic puzzles going by scrolling down.

Get stories like this one in your inbox each morning. Sign up for our daily email here.

Some of Our Favorite Logic Puzzles

Written by Curiosity Staff May 11, 2017

Curiosity uses cookies to improve site performance, for analytics and for advertising. By continuing to use our site, you accept our use of cookies, our Privacy Policy and Terms of Use.