Which answer describes the calculations that could be used to solve this problem? marcela paid a total of $60.63 for 3 sweaters and a skirt. each sweater cost the same amount. the skirt cost $18.78. how much did one sweater cost? a. add $60.63 to $18.78. then divide by 3. b. subtract $18.78 from $60.63. then divide by 3. c. multiply $60.63 by 3. then add $18.78. d. divide $60.63 by 3. then subtract $18.78.