Answer:
68
Explanation:
Hello, the number is 'ab' meaning that we can write it as 10a +b
For instance 42 = 10*4 + 2
So, a = b - 2
and 10a + b + 10b + a = 154
11(a+b)=154
a+b = 154/11 = 14
We replace a by b - 2
b+b-2 = 14
2b = 14 + 2 = 16
b = 8 and then a = 6
the original number is 68.
Thanks