Children and horses

There are some children and horses in a field.  Together they have 39 heads and 122 feet.
How many children are in the field and how many horses are in the field?

Correct answer:

a =  17
b =  22

Step-by-step explanation:

a+b=39 2a+4b=122  a+b=39 2 a+4 b=122  a+b=39 2a+4b=122  a=17 b=22

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