Question 439278
IN A PEN OF GOATS AND CHICKENS, THERE ARE 40 HEADS AND 130 FEET. HOW MANY GOATS AND CHICKENS ARE IN THE PEN??
<pre>
All animals have a pair of front feet. 130 feet is 130÷2 or 65 
pairs of feet.  There are 40 pairs of front feet.  So 
the remaining 65-40 or 25 pairs of feet are hind feet and belong 
to the goats, so there are 25 goats and 40-25 or 15 chickens.


By algebra,

 G +  C = 40
4G + 2C = 130

Solve that and get G=25 and C=15

Edwin</pre>