2 and 3
3 and 4
4 and 5
8 and 9
9 and 10
10 and 11
5 and 6
6 and 7
7 and 8
X = ?
4
16
9
a = ?
25
5
36
1
2.25
n = ?
3
23
20
2
10
y = ?
11