A barrel of oil weighs 12 pounds. If 3/4 of it is used in cooking, how many pounds are left?
From “A barrel of oil weighs 12 pounds. If 3/4 of it is used in cooking,” we need to find the amount of oil used before we find the amount of oil left.
Make the list of the 3 elements to find how many pounds of oil is left:
the amount in 1: 12 pounds, the entire barrel of oil
the fraction: 3/4
the amount in the fraction: the amount of oil used?
the amount of oil used= the amount in a fraction= the amount in 1 x the fraction= 12 x 3/4=9 pounds
Deduct the amount of used oil from entire barrel of oil to find how much oil is left: