450
180
216
320
12. 一直线L过点A, B, 坐标原点为O, 点P为三角形OAB中一点, 问:Y
1/4
3/8
1/2
5/8
3/4
13. If Bob can do a job in 20 days and Jane can do the job in 30 days, they work together to do this job and in this period, Bob stop work for 2.5 days and Jane stop work for x days, and the job be finished for 14 days, what is x?
1.6
3.2
1.5
1.25
1.15
14. The probability of A is 60% and the probability of B is 50%, what is the most possible probability that neither A nor B would happen?
0.80
0.40
0.75
0.55
0.68
15. In an insurance company, each policy has a paper record and an electric record. For those policies having incorrect paper record, 60% also having incorrect electric record; For policies having incorrect electric record, 75% also having incorrect paper record. 3% of all policies have both incorrect paper and incorrect electric records. If we randomly pick out one policy,whats the probability that the one having both correct paper and correct electric records?
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