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?  Choose one
A) 299	B) 297	C) 261	D) 280	E) 172
80* 7: x* 3 = 1:1 1/2   560: 3x = 2: 3   x = 280   Answer: 280
<result>D</result>
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?