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A and B rent a pasture for 10 months. A put in 80 cows for 7 months. How many can B put in for the remaining 3 months, if he pays half as much again as A?

Correct answer: D. 280

  • A. 120
  • B. 180
  • C. 200
  • D. 280

Explanation

A contributes 80 cows x 7 months = 560 cow-months. B must contribute one and a half times this amount, or 560 cow-months x 3/2 = 840 cow-months, and over 3 months this requires 840 cow-months / 3 months = 280 cows. The likely mistake is option c, 200 cows, which does not apply the stated one-and-a-half-times payment.

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