# GMAT Question of The Day: AMOUNT OF BACTERIA PRESENT

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 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

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1. valmik desai says:

GMAT team, the table doesn’t show up in my browser (IE and Mozilla). Thanks.

2. vishal says:

Same here…Thanx

3. Dear GMAT Takers,

Sorry for inconvenience. We rectified it now.

4. Brajesh says:

Hi GMAT Team,

I still can’t see the table, pls do the needful

5. Krishna Mohan says:

6. mamtani says:

Ans: 12

7. nakul_mukerjee says:

Even my answer is 12. Need your suggestions whether my approach to solve the question is right. I did:

(x-10)/10 = (14.4-x)/x
-> x^2-144=0
-> (x+12)(x-12)=0

Any other approaches or a much faster approach?

8. AP says:

a

9. taker says:

C

10. deepakraam says:

I will go with option C

11. gmattaker says:

y = fraction, x = 4:00pm amount
10+10y = x
y = 1/10 * (x-10)

x + xy = 14.4
x +x[1/10 * (x-10)] = 14.4

solve for x and get 12