Question

The width of a rectangle is half as long as the length. The rectangle has an area of 200 square feet. What are the Length and width of the rectangle?

Answer 1

width is x=10, length is 2x= 20

Answer 2

Area is \[2x ^{2}=200\]

Answer 3

Let the sides be a and b.
a = 1/2b;
area = a*b = 200 sq.ft.

substitute a and get
1/2 b*b = 200
1/2 b^2 = 200
b^2 = 400
b = 20

so a = 1/2 b = 10.