15. In a certain game, a large container is filled with red, yellow, green, and blue beads worth, respectively, 7, 5, 3, and 2 points each. A number of beads are then removed from the container. If the product of the point values of the removed beads is 147,000, how many red beads were removed?
(A) 5
(B) 4
(C) 3
(D) 2
(E) 0
我觉得red beads的个数可以是1或2或5或7，根据提供选项，可以是A和D，可答案为D，why？
13. At a loading dock, each worker on the night crew loaded 3/4 as many boxes as each worker on the day crew. If the night crew has 4/5 as many workers as the day crew, what fraction of all the boxes loaded by the two crews did the day crew load?
(A) 1/2
(B) 2/5
(C) 3/5
(D) 4/5
(E) 5/8
答案是E，我觉得应该是10/3。分析如下：晚上工人load的box数是白天的3/4；晚上工人数是白天的4/5；目前是2人，则在白天load的box数=2/（4/5）/（3/4）=10/3。
