Question

Write a system & solve: A farm has only chickens & cows. In total, there are 145 animals. However, there are only 324 animal legs. How many cows are there?

Answer 1

x=17 y=128

Explanation:

x-cows

y=chicken

x+y=145

4x+2y=324

x=145-y

4(145-y)+2y=324

580-4y+2y=324

580-2y=324

580-324=2y

256=2y

y=128

x=145-128

x=17