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While at a zoo I saw some flamingos and lions. I counted 96 legs and 35 heads. How many lions did I see at the zoo?

 Mar 3, 2020
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f= flamingoes             2f = legs       f = heads

l = lions                      4l = lions      l = heads

 

2f + 4l = 96

f   +  l = 35     since we are looking for lions, let's eliminate the 'f's        Multiply this equation by -2

-2f  -2l = -70      and add this to the first equation to get

 

     2l = 26      so   l = 13 lions

 Mar 3, 2020

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