15 + 15 + 15 = 15 * 3 = 45
22 + 22 + 28 = 22 * 2 + 28 = 44 + 28 = 72
52 + 25 = (50 + 20) + (2 + 5) = 70 + 7 = 77
4 + 4 + 4 + 4 = 4 * 4 = 16
6 + 6 + 6 + 6 = 6 * 4 = 24
3 + 3 + 3 + 3 = 3 * 4 = 12
7 + 8 + 6 = 15 + 6 = 21
9 + 9 = 9 * 2 = 18
7 + 7 + 7 = 7 * 3 = 21