the perimeter of a rectangle is 210cm. the ratio of the width to the length is 3:4. what is the length of the rectangle?

length = 60 cm

Step-by-step explanation:

ratio of width : length = 3 : 4 = 3x : 4x

perimeter = (2 * width) + (2 * length) = 6x + 8x = 14x

now perimeter = 210, hence

14x = 210 (divide both sides by 14)

x = 15

hence length = 4 * 15 = 60 cm