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There are crows and groundhogs in a field. All of them together have 15 heads and 40 legs. How many of each animal are in the field?

 Jul 9, 2020
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Let x be the number of crows and 15-x the number of groundhogs. Note that crows have 2 legs and groundhogs 4. We form an equation for the number of legs.

 

2x+4(15-x)=40

2x+60-4x=40

-2x=-20

x=10

 

There are 10 crows and 15-10=5 groundhogs.

 Jul 9, 2020

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