Rahzel wants to determine how much gasoline he and his wife use in a month. he calculated that he used 78 1/3 gallons of gas last month. rahzel's wife used 41 3/8 gallons of gas last month. how much total gas did rahzel and his wife use last month. round your answer to the nearest hundredth. ( use a calculator to convert the fractions into decimals before calculating the sum or difference).