You need to work out how many seats you can fit in an area of the arena for an upcoming 5 a-side football match. the formula to use is: number of seats = lw/0.5 (when l means length and w means width) using the measurements below work out how many seats are needed. 15m = length 3m = width

1. The problem gives you the formula to calculate the number of seats, which is:
 
 number of seats=lw/0.5
 x=lw/0.5
 
 Let's call the number of seats "x".
 "l" is the length (l=15 meters).
 "w" is the width (w=3 meters).

 2. Then, you only have to substitute these values into the formula x=lw/0.5, as below:
 
 x=lw/0.5
 x=(15x3)/0.5
 x=45/0.5
 
 3. Therefore the number of the seats is:
 
 x=90 seats