Question

$\begin{array}{c}AB\\ +AB\\ +B\\ BB\end{array}$
Find the value of A and B.

• A. A=2,B=5
• B. A=3,B=6
• C. A=3,B=5
• D. A=4,B=6

Answer 1

The correct option is A A=2,B=5

B + B + B = B → on adding B three times, we are getting B again at unit's place. This is only possible if B is either 0 or 5.

0 + 0 + 0 = 0 and 5 + 5 + 5 = 15;
So, 1 is carry. The answer is BB i.e., 55.

∴ Now we have

1 + A + A = 5

2A = 4

A = 2