Q. Jesse bought 31 of a gallon of gas for $.40 how much would a whole gallon of gas cost?
Understand the problem: Step 1: Understand the problem.Jesse bought 31 of a gallon of gas for $0.40. To find the cost of a whole gallon, we need to multiply the cost of 31 gallon by 3.Calculation: $0.40×3=$1.20
Check the calculation: Step 2: Check the calculation.Multiplying $0.40 by 3 should give us the cost of a full gallon since 3×(1/3)=1, which represents a whole gallon.Calculation: 3×$0.40=$1.20
More problems from Percents of numbers: fractional and decimal percents