1) a = 9.
9 * 11 = 99.
99 - 13 = 86.
86 > 60, => 86 / 2 = 43.
b = 43.
2) a = 5.
5 * 11 = 55.
55 - 13 = 42.
42 < 60, => 42 - 19 = 23.
b = 23.
3) a = 7.
7 * 11 = 77.
77 - 13 = 64.
64 > 60, => 64 / 2 = 32.
b = 32/
4) a = 4.
4 * 11 = 44.
44 - 13 = 31.
31 < 60, => 31 - 19 = 12.
b = 12.
5) a = 6.
6 * 11 = 66.
66 - 13 = 53.
53 < 60, => 53 - 19 = 34.
b = 34.