请教三题数学 Prep GMAT

gavin1911

1. Of 60 Animals, 2/3 is either pigs or cows.  How many cows they have.

a) the farm has more than twice as many pigs as cows.

b) There are no less than 12 pigs

我选择A, a) okay, b) ns.; 大; 答案是C, both together sufficient