help me with my math

Question

In a rectangle, the ratio of the width to the length is 4:5. If the rectangle
is 28 centimeters width, find its length.

Answer 1

Hi, Ahmad.

Okay, so the ration of the width to length is 4:5

Therefore:

4/5 = 28/X   where X is the length of the rectangle

Now, cross multiply:

4X = 140

X = 35

Therefore, the length is 35 centimeters