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Review: Albert's Coins
Explanation
In this question, we could pick the numbers for a case,
but the algebra looks friendly, so we can write
Where n stands
for CaNdice, since Albert already has the variable c, contrary to intuitive naming. We want to obtain n + b,
so we can multiply both equations and add them:
Bob and Candace have 
coins, and Albert has c coins, so the difference is 
.
Another way to solve this question is to choose values.
You can set c = 12, b = 3 and N = 36. The difference is 
,
which is indeed 
.
The correct answer is (B).
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