algebra
posted by Jarrad .
A farm raises a total of 220 chickens and pigs. The number of legs of the stock in the farm totals 520. how many chickens and pigs are there on the farm.
using systems of equations to solve

number of chickens  c
number of pigs  p
c+p = 220
2c + 4p = 520 or c + 2p = 260
subtract then
p = 40
back into the first
c+40 = 220
c = 180
180 chickens, 40 pigs