Answer
a. 1/2 gallons of oil should be mixed with 10 gallons of gas.
b. 2 quarts of oil should be mixed with 40 quarts of gas.
Work Step by Step
a. 10 (number of gallons you have)/20 (the ratio used in the gas-oil needed formula) =1/2 gallon
b. 1/2 (number of gallons you have) x 4 (number of quarts in a gallon) = 2 quarts; 10 (gallons of gas you have) x 4 (number of quarts per gallon) = 40 quarts
