11/02 math JJ from Korean

Michelle_winnerUID: 2719084

11/03 math JJ from Korean11/03 from Korean math JJ ( answer at the end also from Korean, so not sure right or wrong)
hehe^^

1. In a certain country a person is born every 3 seconds and a person dies every 10 seconds. Therefore the birth and death rates account for a population growth rate of one person every:

a. 3 1/3 sec
b. 4 2/7 sec
c. 7 sec
d. 11 2/3 sec
e. 13 sec

2. A train travels for 60 miles per hour for three hours and then 45 miles per hour for 2 hours. What is the train's average speed in miles per hour during the five hour period?

a. 55
b. 54
c. 52.5
d. 51
e. 50

3. At 9:00 am train T left the train station and two hours later train S left the same station on a parallel track. If train T averaged 60 kmph and train S averaged 75 kmph until S passed T, at what time did S pass T?

a. 2:00 pm
b. 5:00 pm
c. 6:00 pm
d. 7:00 pm
e. 9:00 pm

4. By weight liquid A makes up 7 percent of solution I and 14.5 percent of solution II. If 3 grams of solution I is mixed with 2 grams of Solution II, then the liquid A accounts for what percent of the weight of the resulting solution?

a. 6.09%
b. 10%
c. 10.75%
d. 21.5%
e. 50%

5. One bacterial cell of a certain type is placed in a petri dish. Cells of this kind divide once every day.

The total number of OR 6
bacterial cells in the dish
at the end of 4 days if no cells die.


6. Which of the following could be the area of an isosceles triangle with perimeter 18 and one side of length 8?

a. 6
b. 12
c. 14
d. 16
e. 18
answer:

1.b2.b
3.d
4.b(?)
5.96?

scott_umacUID: 2414907

1. b
2. b
3. b
4. b
5. 96
6. b

Michelle_winnerUID: 2719084

但是，印度网的的结果是：
1-b
2-b
3-d
4-b
5-96
6-a
不知道第一题和第五题是怎么出来的？
能否帮助一下？
谢谢， 我觉得第五题的答案应该是90吧？

tianrunheUID: 2474327

3是d，5是96，因为是divide，比如之前一个cell，divide之后变成2个而不是3个，6是b，三边分别是5,5,8，高是3，8*3/2=12

Michelle_winnerUID: 2719084

谢谢，但还是不太明白第五个题目， 6 个变成12个，12个变成24个，24个变成48个。然后相加，这样不对吗？

scott_umacUID: 2414907

第五题. 6-12-24-48-96 不用相加
第三题为什么是d？ 我算的结果是8个小时后可以追上 那么应该是下午5点 5：00pm

XAHUID: 2707226

要加上之前的2个小时

Michelle_winnerUID: 2719084

5# Michelle_winner
知道啦，谢谢，我真笨啊
呵呵

EMINEM830505UID: 2406976

谢谢分享!