# Math Help - Smaller Billboard

1. ## Smaller Billboard

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.

Help!

2. Hi,
i think u can use following way
Let the sides of first rectangle be 5x & 5y
than other has 4x & 4y
for covering u need to see the area(else see the unit of quantity given)
now, u have
area of first =25x*y=250......(1)
u have to find
area of second =16x*y=?.....(2)
u can get the value from (1) put it in (2) u get the ans.