a rectangular prism shaped fish tank is 9 inches tall. The perimeter of the base is 56 inches. The length of the base is 3 times the width of the base. What is the volume?

Answer 1

the perimeter of the tank is 56 on side is 3x the other

so 56 = 2(x+3x)

56 = 2x +6x

56 = 8x

x = 7

sides of the tank are 7 x 21

Volume equals 7 x 21 X 9 = 1323