A car wash had to make their soap last 8 days .If they only have one-seventh of a gallon of soap ，how many should they use each day so it lasts 8 days ？
The car wash has 1/7 gallons of soap and they can use 1/8th of it each day. So, you would set up [tex]\frac{1}{7}[/tex] x [tex]\frac{1}{8}[/tex] = [tex]\frac{1}{56}[/tex].
