Let the number of cows be x and hens be y.
A cow and a hen has 1 head each. Each cow has 4 legs
and each hen has 2 legs
x + y = 30 .............(i)
total number of heads
4x + 2y = 80 ................ (ii)
total number of legs
Multiply eqn. (i) by 2
2x + 2y = 60
4x + 2y = 80 - substruct
-2x = -20;
x = 10
Using x + y = 30
10 + y = 30;
y = 20
Cows are 10, hens are 20
johnmulu answered the question on June 8, 2017 at 11:56
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