Of the 60 animals on a certain farm, 2/3 are either pigs or cows, how many of the animals are cows?
(1) the farm has more than twice as many cows as it has pigs.
(2) the farm has more than 12 pigs.
举报
Ans:E
pig+COW=20
2P+P〈=20,so P<=6,那COW就有可能是14,15,16。。。。,(1)不满足
(2)单独肯定不满足
(1)+(2)也不满足
? 你是说给出的答案是C?
那你自己觉得应该是什么答案?
答案是E, 但是 pig + cow 应该是等于40( 60*2/3)
pig+cow=40
(1)cow>2倍的pig
(2)pig>12
(1)+(2)得pig=13,cow=27
所以是c
agree
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