Calling the number is: ab.
According to the output we have: ab = (a + b) x 8
<=> 10a + b = 8a + 8b
=> 2a = 7b
=> A = 7; B = 2
So the number to find is 72

Calling the number is: ab.
According to the output we have: ab = (a + b) x 8
<=> 10a + b = 8a + 8b
=> 2a = 7b
=> A = 7; B = 2
So the number to find is 72