Which equation can be used to find the answer? joelle's stamp book has room for 54 stamps. she already has 38 stamps in the book. how many more stamps does she need to fill the book? a. s – 38 = 54 s = 92 92 stamps b. 2 · s = 54 s = 27 27 stamps c. s + 38 = 54 s = 16 16 stamps d. s ÷ 2 = 38 s = 76 76 stamps