Answer:
60
Step-by-step explanation:
Let the side of the square (s) = 3x
Then a rectangle is 3x long and x wide
P = 2l + 2w
40 = 2×3x + 2x = 6x +2x = 8x
x = 40/8 = 5
For the square,
s = 3x = 3 × 5 = 15
P = 4s = 4 × 15 = 60
The perimeter of the square is 60.
