[問題]GWD2gmat-23

[sandyclub]

Q23:

AMOUNT OF BACTERIA PRESENT

Time Amount
1:00 P.M. 10.0 grams
4:00 P.M. x grams
7:00 P.M. 14.4 grams

Data for a certain biology experiment are given in the table above. If the amount of bacteria present increased by the same fraction during each of the two 3-hour periods shown, how many grams of bacteria were present at 4:00 P.M.?

A. 12.0
B. 12.1
C. 12.2
D. 12.3
E. 12.4

答案是A

我呆呆的得到C 請求解題之連結

[huacy]

14.4/x=x/10.0
交差相乘後 x[sup]2[/sup]=144.0 所以 x=12.0

[sandyclub]

14.4/x=x/10.0
交差相乘後 x[sup]2[/sup]=144.0 所以 x=12.0

我不知道哪來的想法 用了(10-x)/(x-14.4)=(4-1)/(7-3)

亂湊答案 我是笨笨

多謝huacy