Set Two Q23

[wvspidermonkey]

Q23:
Amount of bacteria present
Time Amount
1pm 10.0 grams
4pm x grams
7pm 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
Formal answer: A

My answer: C Logically, what am I missing?

I thought this was a sequence question …… n2=(n1+2.2), n3=(n2+2.2), n4=(n3+2.2)

Thank you for the help. I really don't understand why my answers are different. Am I that far off the mark? I'm worried. Thank you again. A

[kevin]

Q23:
Amount of bacteria present
Time Amount
1pm 10.0 grams
4pm x grams
7pm 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
Formal answer: A

My answer: C Logically, what am I missing?

I thought this was a sequence question …… n2=(n1+2.2), n3=(n2+2.2), n4=(n3+2.2)

Thank you for the help. I really don't understand why my answers are different. Am I that far off the mark? I'm worried. Thank you again. A

It is a sequence, but not an arithmetic sequence in which two consecutive terms have the same difference. This is a geometric sequence, inn which two consecutive terms are always in the same ratio, as with compound interest

[wvspidermonkey]

I'll have to go back and review this again. I'll probably have another quesiton.

Thank you!
A