13, 6, 2 = 20
4, 9, 5 = 11
9, 2, 3 = 25
15, 5, 4 = ?
55
13 * 2 - 6 = 20
4 * 5 - 9 = 11
9 * 3 - 2 = 25
15 * 4 - 5 = 55
55
13 * 2 - 6 = 20
4 * 5 - 9 = 11
9 * 3 - 2 = 25
15 * 4 - 5 = 55