未知题型
A box contains 90 jelly beans, of which some are orange, some are purple, and some are black. How many black jelly beans are in the box?
(1) There are 27 orange jelly beans.
(2) There are twice as many purple jelly beans as orange jelly beans.
A.B.
【参考答案】
C
C 解析：alone is not sufficient, because there could be 6......
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