M4maths Previous Puzzles

22 Dec 2017 Number

AB is a 2 digit odd number. If you subtract it from the number formed by reversing the digits(BA), you get 18 as result. What is the product of A and B?
Please note that A and B both are odd numbers greater than 5.

OPtion

1) 57
2) 15
3) 03
4) 63
5) 35
6) 53
7) 75
8) 39
9) 57
10) None of these

Solution

As per question
BA-AB = 18
So
10B+A-10A-B = 18
9B-9A = 18
B-A=2

As A and B both are odd numbers greater than 5 so only possible values of A and B which satisfy B-A=2 are:
A=7 and B=9

So Product of A and B = 7*9 =63

Correct Option: 4 Best Solution (4)