100 − 99 = 1
1 * 25 = 25
25 : 5 = 5
5 * 16 = 80
80 − 48 = 32 = x

 
3 * 22 = 66
66 + 16 = 82
82 − 34 = 48
48 : 2 = 24
24 : 24 = 1 = y

 
90 − 69 = 21
21 * 2 = 42
42 + 35 = 77
77 : 11 = 7
7 * 14 = 98 = k