Hi,

A zoo has some lions and ostriches. 

A zoo has  lions  and ostriches 

Pet Sitting guy spoke 15 heads and 50 legs. How many lions?

   x + y = 15  0r  y =

  4x + 2y = 50

  4x + 2(15-x) = 50   |Substituting for y

         2x = 20

          x =  lions

  CHECKING our answer***

  40 + 10 = 50 legs 

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