Raymond B. answered 04/06/21
Math, microeconomics or criminal justice
12S + 16L = 684
S + L = 47, multiply both sides by 12 to get
12S + 12L = 564
subtract last equation from the 1st to eliminate one variable
4L = 120
L = 120/4 = 30 long sleeve shirts sold
S = 47-30 = 17 short sleeve shirts sold