Question

Given

A A A

+ A A

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

A B B

If A is a multiple of $3$. what is the possible value of B?

• A. $9$
• B. $6$
• C. $3$
• 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 is a multiple of $3$, a could be $0$ or $3$. A cannot be 0.

So, A $=3$, then B $=$ A + A $=6$. (option B).