Write an equation to solve the following. The perimeter of a rectangular photo is 72 cm. The length is twice the width. What are the length and width of the photo?

Question

Write an equation to solve the following. The perimeter of a rectangular photo is 72 cm. The length is twice the width.  What are the length and width of the photo?

colouringme · Answer

first let the length represented by width...
l=...w

anonymous · Answer

first let the lenght represented by width..
l=..w

anonymous · Answer

rember that

anonymous · Answer

The perimeter of a rectangle is 2*length + 2*width 

If we call the width x, then we can write 'The length is twice the width' as length=2x

So the perimeter = 72 = 2*2x +2*x

Collecting terms we have 72 = 6x, then dividing both sides by 6 we get x = 12

So the width is 12cm and the length is 24cm