A pet store owner sells canaries and cages. If he puts one canary per cage, he has an extra canary. If he puts two canaries in each cage, he has an extra cage. How many canaries and how many cages does he have?
Answer:
4 canaries and 3 cages
x = canaries
y = cages
x = y +1 (one canary per cage)
x = 2y -2 (two canaries per cage)
y + 1 = 2y -2
y = 3
x = 4
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