[求助]请教一句话的意思

feynman烨

thax

发帖的第二天就出发去考试了，在考场上明白了这个道理……终于在那些选项里发现我把话的意思搞反了！我搞成pigs>2cows了

glaxx

of the 60 animalson a certai farm, 2/3 are either pigs or cows

=>pigs + cows=60*2/3=40

1 the farm has more than twice as many cows as it has pigs

=>cows>2*pigs, pigs + cows=40

=>3*pigs<40

=>pigs<40/3=13.33

2 the farm has more than 12 pigs

=>pigs>12

pigs>12, and pigs<13.33

=>pigs=13

=>cows=40-13=27

=>choose both but not each....

feynman烨

请教一句话的意思

the farm has more than twice as many cows as it has pigs

被一道prep数学卡了，怀疑是这句话的理解问题~

多谢众位大虾~

=============原题========

a problem from prep:

of the 60 animalson a certai farm, 2/3 are either pigs orcows. 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

answer: both together are sufficient but .......