Length of Second Rectangle

[nycmathguy]

A rectangle has a length of 72 cm and a width of 56 cm. A second rectangle has the same area as this one, but its width is 21 cm. What is the length of the second rectangle?

Area of first rectangle:

A = 72cm(56cm)

A = 4,032 cm^2

Area of first rectangle = area of second rectangle.

Width of second rectangle = 21 cm.

Length of Second rectangle = L

Area = LW

4,032 = L(21 cm)

4,032/21 cm = L

192 cm = L

 

[MathLover1]

correct

 

[nycmathguy]

correct

Another easy practice problem to help flex the brain muscle.