Solving an age problem with basic math

by casi
(pueblo)

Janet and younger brother Jared are 5 years apart. The sum of their ages is 13. How old is each?

Solution by Trial and error

13 = 12 + 1 The difference is 11

13 = 11 + 2 The difference is 9

13 = 10 + 3 The difference is 7

13 = 9 + 4 The difference is 5

So they must be 9 and 4 years old.

Since Jared is the younger brother, he is 4.

Then, Janet is 9.














































































































































































































































Click here to post comments

Join in and write your own page! It's easy to do. How? Simply click here to return to Basic math word problem.

Recent Articles

  1. Box and Whiskers Plot

    Nov 18, 22 08:20 AM

    Easily learn to construct a box and whiskers plot for a set of data by using the median and the extreme values.

    Read More

  2. Binary Number System

    Nov 17, 22 10:53 AM

    This lesson will give you a deep and solid introduction to the binary number system.

    Read More

Tough algebra word problems

100 Tough Algebra Word Problems.

If you can solve these problems with no help, you must be a genius!

Math quizzes

 Recommended

Math vocabulary quizzes