Help! Farmer Doug has some pigs and chickens. One day he counted 24 legs 7 heads in the barnyard. How many of each animal did Farmer Doug Count? __ With Explanation, please!

There would be 5 pigs because 5 x 4 = 20 and that would be 5/7 pigs and then 4 legs/2 heads left over and chickens have 2 legs so 2 chickens and 5 pigs