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Question

Given
A A A
+ A A
--------------
A B B
If A2= B, then A + B is:

A
8
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B
6
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C
4
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D
2
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Solution

The correct option is A 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)

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