Posted by Anonymous on Friday, March 18, 2011 at 9:16am.
Let P = pigs and C = chickens
P + C = 220 or
P = 220 - C
4P + 2C = 520
Substitute 220-C for P in second equation and solve for C. Insert that value into the first equation and solve for P. Check by inserting both values into the second equation.
69
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