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# a GWD math (7) , which hasn't been discussed

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a GWD math (7) , which hasn't been discussed [#permalink]  20 Aug 2011, 05:35
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Question Stats:

50% (02:34) correct 50% (01:21) wrong based on 0 sessions
AMOUT OF BACTERIA PRESENT

Time Amount
1:00 pm 10.0 grams
4.00 pm x grams
7.00 pm 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 pm?

a)12.0
b)12.1
c)12.2
d)12.3
e)12.4
[Reveal] Spoiler: OA
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Re: a GWD math (7) , which hasn't been discussed [#permalink]  20 Aug 2011, 09:05
Ratio problem

According to the given conditions

x/10=14.4/x
x^2=144
x=12
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Re: a GWD math (7) , which hasn't been discussed [#permalink]  20 Aug 2011, 11:11
let p be the fraction by which it increased

1pm 10 gms

4pm x gms = (1+p)10

7pm 14.4 gms = (1+p)x

=> x/10 = 14.4/x

=> x =12

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Re: a GWD math (7) , which hasn't been discussed [#permalink]  21 Aug 2011, 02:30
Should the statement say something like "if the growth (or rate of growth) increases". Because if the amount increases by the same fraction, it would always double for example.
Re: a GWD math (7) , which hasn't been discussed   [#permalink] 21 Aug 2011, 02:30
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