The difference between a two digit number and the number formed by reversing it is 70. Then the difference between the two digits of the number is.
4
1
6
2
None of these
10a + b - (10b + a) = 70
10( a - b) + b - a = 10 × 7 + 0
a - b = 7
b - a = 0
The sum of the digits of a two digit number is 8 and the difference between the number and that formed by reversing the digits is 8. Find the number.