[求助]很郁闷的一道DS题

In a certain packinghouse, grapefruit are packed in bags and the bags are packed in cases. How many grapefruit are in each case that is packed?  A

(1) The grapefruit are always packed 5 to a bag and the bags are always packed 8 to a case.

(2) Each case is always 80 percent full.

答案是A

但这里的条件二到底是个条件项呢还是个迷惑项啊？郁闷很。。。考试碰到这种题咋办呀

还请大牛们指点啦~~~

（1）5*8=40，这就是答案。（2）没用，我又不知道80percent是几只bag,更不知道每个bag里有几个grapefruit。

哦。。。这里的条件1和2结合起来也不行，因为条件2的80%的容量没对bag和grapefruit个数做限制，而条件1是针对每个case都装满来限制的。thx 啦~~~