Using Addition to Solve Equations

Question

Mr wilheim wrote down the amount of wax used for the Betsey Ross Statute. For the queen, he would .6 gallons less for the arms and 1.5 gallons less for the legs. That meant he would use 39.4 gallons of wax for Queen Elizabeth I. How many gallons did Mr. Wilheim use for Betsy Ross.

Answer 1

39.4 + 0.6 + 1.5 = ?