The ratio of the number of math books to the number of comic books on a shelf is 7:3. There are 21 comic books on the shelf. Find the number of math books on the shelf.

Question

asked Jan 24, 2021 38.6k views

2 Answers

Enfield Li · Answer 1 · 2021-01-27T21:10:23+0000

Answer:

Explanation:

Let the number of math books on the shelf be
.

$7:3\\x:21$

Cross multiply the ratio and solve for
.

$3x=7 * 21\\3x=147\\x=49$

There are 49 math books on the shelf.