Question

46 in a farm there are cows and hens. The
heads counted are 180 and the legs counted
are 420. Then find the number of cows in
the farm.
(A) 150
(B) 30
(C) 130
(D) 50
(E) None of these​

Answer 1

Answer:

30

Step-by-step explanation:

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Answer 2

Answer:

B

Step-by-step explanation:

A cow and a hen each has a head. If the total number of cows be x, then Number of hens = 180 – x A cow has four legs and a hen has two legs ∴

∴ (180–x) × 2 + 4x = 420 ⇒360 – 2x + 4x = 420

⇒ 2x = 420 – 360 = 60

⇒ x = 60/20 = 30