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Zoo

monkey

Answer:
There were twelve monkeys and twenty-three zebras.
Monkeys (m) + zebras (z) = 35 heads
m + z = 35
2 legs per monkey (2m) + 4 legs per zebra (4z) = 94 heads
2m + 4z = 94
Subtract doubled second equation from the first:
2m + 4z - 2m - 2z = 94 - 70
2m = 24
m = 12
z  = 35 - 12 = 23

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