The lengths of the sides of two similar rectangular billboards are in the ratio 5:4. If 250 square feet of material is needed to cover the larger bill-board,
how much material, in square feet, is needed to cover the smaller billboard?
This is my work:
5x + 4x = 250
9x = 250
I then divided and got a decimal number.
I knew then that my answer was wrong.
I played with this question for 20 minutes in vain.