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?

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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?

A. 120
B. 180
C. 200
D. 280
Explanation:
80* 7: x* 3 = 1:1 1/2
560: 3x = 2: 3
x = 280