Question

13. The length of a rectangle is 9 cm more than 2 times the width. If the perimeter of the rectangle is 60 cm,

what are its dimensions?
a. length = 7 cm; width = 23 cm
b. length = 5 cm; width = 16 cm
C. length = 23 cm; width = 7 cm
d. length = 23 cm; width = 16cm

Answer 1

• C. length = 23 cm; width = 7 cm

Explanation:

Let the width is x, then the length is:

• l = 2x + 9

Perimeter is:

• P = 2(l + w)
• 60 = 2(x + 2x + 9)
• 30 = 3x + 9
• 3x = 21
• x = 7

Dimensions are:

• Width = 7 cm, length = 2*7 + 9 = 23 cm

Correct choice is C