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The zoo had some lions and some parrots. The supervisor counted 15 heads and 50 legs. How many Lions were there?
- 9
- 10
- 12
- 13
x + y = 15
4x + 2y = 50
4x + 2(15-x) = 50 :y=15-x
2x = 20
x=10
verification of answer is:
40 + 10 = 50 legs
x + y = 15
4x + 2y = 50
4x + 2(15-x) = 50 :y=15-x
2x = 20
x=10
verification of answer is:
40 + 10 = 50 legs