Question

The area of a rectangular ice-skating rink is 900 square yards. If the length of the rink is 100 yards, want is the width of the rink? .

Answer 1

The width would be 90.

900/100=90

Since it give you the over all square yards, you take that number and divide it by what ever the number would be and that gives you the answer.

Answer 2

Well if you do the area divided by the length 
900/100 
You should get the length with would be 9 
Width=9