Question

A farmer has a total of 21 cows and chickens altogether The animals have 54 legs how many cows and how many chickens does the farmer have?

Answer 1

4p+2c=54
4p+2(21-p)=54
4p+42-2p=54
2p+42=54
2p=12
p=6

4p+2c=54
4(6)+2c=54
24+2c=54
2c=30
c=15

p=6, c=15