Multiple choice general knowledge math & puzzles

I am the owner of a pet store. If I put in one canary per cage, I have one bird too many. If I put in two canaries per cage, I have one cage too many. How many cages and canaries do I have?

  1. 3 cages and 4 canaries

  2. 2 cages and 4 canaries

  3. 3 cages and 3 canaries

  4. None of the above
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A Correct answer
Explanation

Let x be canaries and y be cages. x = y + 1 and x = 2(y - 1). Substituting: y + 1 = 2y - 2, so y = 3. Then x = 4. Thus, 3 cages and 4 canaries satisfy both conditions perfectly.

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