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The Zoo had some lions and some parrots. The supervisor counted 15 heads and 50 legs. How many lions are there?
  1. 5
  2. 10
  3. 30
  4. 40
Explanation

A zoo has some lions and Parrots.

A zoo has x lions and y parrots

 The supervisor counted 15 heads and 50 legs. How many lions are there?

Heads

x + y = 15 

y = 15 – x

 

x = 4 legs and y has 2 legs

4x + 2y = 50

4x + 2(15-x) = 50

4x + 30 – 2x = 50

2x = 20

X = 20/2

X = 10

 

So x means lions, so there 10 Lions

 

CHECKING our answer***

  40 + 10 = 50 legs

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