Question

Xtritonshd The length of a rectangle is 3 times its width. The rectangle's width is 5 m. What is the area of the rectangle.

Answer 1

hello: 
let : x the length  and : y  the width
 xy  the area.
x = 3y...(1)
x = 15m
the area is : 15×5 =75 m²