Question

   A B
    x 5
C A B

Answer 1

As we need B at unit place and A at ten’s place,
B = 0 as 5 x 0 = 0
Now we want to find A, 5 x A = A (at unit’s place)
A = 5, as 5 x 5 = 25
C = 2

   5 0
    x 5
 2 5 0