[計量] Strange JJ
9. Roger sold a watch at a profit of 10%. If he had bought it at
10% less and sold it for $13 less he would have made a profit of 15%.
What is the cost price of the watch?
A) $220
B) $300
C) $400
D) $480
E) $540
Ans: A
7. If from jan 1 1990 to jan 1 1995 i.e. in 5 yrs the population increased by
15% and from jan1 1990 to jan 1 2000 i.e. in the period of 10yrs the population
increased by 30%
col a: the population increase from jan 1 1995 to jan 1 2000
colb :15%
How many combinations of three numbers from 1 to 10 can be made such that x<y<z.
where x,y,z belongs to 1 to 10
ex: (1,2,3) ; (2,4,10)
Ans: 512
Probability that it will rain on monday and not on tuesday is 0.4
Probability that it will rain on tuesday and not on monday is 0.2.
Cola: Probability that it will not rain on both the days
Colb: 0.35
Ans: A???
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推
10/23 00:49, , 1F
10/23 00:49, 1F
→
10/23 00:49, , 2F
10/23 00:49, 2F
推
10/23 02:50, , 3F
10/23 02:50, 3F
→
10/23 02:51, , 4F
10/23 02:51, 4F
推
10/23 13:51, , 5F
10/23 13:51, 5F
→
10/23 13:52, , 6F
10/23 13:52, 6F
推
10/23 15:12, , 7F
10/23 15:12, 7F
→
10/23 15:14, , 8F
10/23 15:14, 8F
→
10/23 15:14, , 9F
10/23 15:14, 9F
→
10/23 15:15, , 10F
10/23 15:15, 10F
推
10/23 15:48, , 11F
10/23 15:48, 11F
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