answer: 32
Consider 2 digit numbers whose sum is 5
5
x
0
→
5
+
0
=
5
4
x
1
→
4
+
1
=
5
3
x
2
→
3
+
2
=
5
Now reverse the digits and compare with original 2 digit number. Starting with 4 1
4
x
1
→
1
x
4
and
41
−
14
=
27
≠
9
3
x
2
→
2
x
3
and
32
−
23
=
9
⇒
the number is
32
