Given the perimeter of a rectangle and either the length or width, find the unknown measurement using the appropriate formula. the perimeter is 76 cm and the length is 20 cm. what is the width of the rectangle? show all your work

The fromula of a perimeter of rectangle:

P = 2(l + w)

We have P = 76 cm and l = 20 cm.

Substitute:

2(20 + w) = 76      use distrubutive property

(2)(20) + (2)(w) = 76

40 + 2w = 76     subtract 40 from both sides

2w = 36      divide both sides by 2

w = 18

ruth is 6 years old

step-by-step explanation:

6 + 24 = 30,   so 6/30 = .2  

if you do 1/5 it also equals .2, so that is the answer.