Question

The area of rectangular piece of metal is 30 centimeters. The peice is 4 centimeters wide. How long is it

Answer 1

7.5 cm

Explanation:

The formula of an area of a rectangle:

`A=w\cdot l`

w - width

l - length

We have

`A=30\ cm^2;\ l=4\ cm`

Substitute:

`30=4w` divide both sides by 4

`(30)/(4)=(4\!\!\!\!\diagup w)/(4\!\!\!\!\diagup)\\\\7.5=w\to w=7.5\ cm`

Answer 2

7.5

Explanation:

30/4=7.5