Pets in ZOO

The zoo have run for pets. They are chickens, pigs and cow. Altogether there has 20 heads and 60 feet. How many chickens and piglets are there?

Correct result:

x =  10
y =  9

Solution:


x+y+1 = 20
2x+4y+4=60

x+y+1 = 20
2•x+4•y+4=60

x+y = 19
2x+4y = 56

x = 10
y = 9

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