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WBCS Preliminary Examination 2022 — General Studies · Question 190 of 200

Q190
ArithmeticNumber System, LCM/HCF & Divisibility
In a group of cows and hens, the number of legs are 14 more than twice the number of heads. How many cows are there?
  1. a.7
  2. b.12
  3. c.5
  4. d.10

Answer: (A) 7

Let cows = y, hens = x. Total heads = x + y. Total legs = 4y + 2x. Condition: 4y + 2x = 2(x + y) + 14 → 4y + 2x = 2x + 2y + 14 → 2y = 14 → y = 7. There are 7 cows.

Q189 Whole paperQ191