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At a certain farm, all of the 240 animals are either cows or pigs, and 180 of the animals have been fed today....

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by Vincen » Sun Dec 26, 2021 10:16 am

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At a certain farm, all of the 240 animals are either cows or pigs, and 180 of the animals have been fed today. There are 80 cows on the farm. If 45 of the pigs have not been fed today, how many of the cows have been fed today?

A. 15
B. 45
C. 60
D. 65
E. 115

Answer: D

Source: Manhattan GMAT
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Re: At a certain farm, all of the 240 animals are either cows or pigs, and 180 of the animals have been fed today....

by swerve » Sun Dec 26, 2021 12:08 pm
Vincen wrote: ↑
Sun Dec 26, 2021 10:16 am
 At a certain farm, all of the 240 animals are either cows or pigs, and 180 of the animals have been fed today. There are 80 cows on the farm. If 45 of the pigs have not been fed today, how many of the cows have been fed today?

A. 15
B. 45
C. 60
D. 65
E. 115

Answer: D

Source: Manhattan GMAT
There are \(80\) cows in the farm. Total number of animals \(=240.\) Therefore, number of pigs\(= 240-80=160.\)

Among \(160\) pigs \(45\) weren't fed. Therefore pigs fed today\(= 160-45= 115\)

Total \(180\) animals were fed today, among which \(115\) are pig. Rest would be cows

Therefore, number of cows fed today\(= 180-115=65\)

Therefore, D
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