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Assume that 20 cows and 40 goats can be kept for 10 days for Rs.460. If the cost of keeping 5 goats is the same as the cost of keeping 1 cow, what will be the cost for keeping 50 cows and 30 goats for 12 days?

Correct answer: A. Rs.1104

  • A. Rs.1104
  • B. Rs.1000
  • C. Rs.934
  • D. Rs.1210

Explanation

Let one goat's daily cost be g rupees, so one cow's daily cost is 5g rupees. The given cost gives (20 x 5g + 40g) x 10 days = Rs.460, so 1400g = Rs.460 and g = Rs.23/70 per day. The new cost is (50 x 5g + 30g) x 12 days = 3360g = 3360 x Rs.23/70 = Rs.1104. The likely mistake is option d, Rs.1210, from failing to apply the 12-day duration or the five-goats-to-one-cow cost relation.

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