Question

Given

A A A

+ A A

--------------

A B B

If A${}^2=$ B, then A + B is:

• A. 8
• B. 6
• C. 4
• D. 2

Answer 1

Answer: (B)

6

A A A
+ A A
A B B
Which means no carry over, thus A will be smaller than 5 and hence B will be smaller than 9.
If A ${}^2$ = B and A + A = B

i.e. A ${}^2$ = 2A.

So, A must be 2 and B must be 4.

So, A+B = 2+4 = 6. (option B)