55. 
Malik's recipe for 4 servings of a certain dish requires 1  cups of pasta.  According to this recipe, what is the number of cups of pasta that Malik will use the next time he prepares this dish?

(1)  The next time he prepares this dish, Malik will make half as many servings as he did the last time he prepared the dish.

(2)  Malik used 6 cups of pasta the last time he prepared this dish.
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【答案】C
【思路】4 serving/cup, how many cup next time?
(1) how many serving last time?  -------------------------------------------------insufficient
(2) 6 4=24 serving last time------------------------------------------------------ insufficient
(1)(2) this time serving=24    =12   =3cup------------------------------ sufficient

没看懂：（