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# A glass was filled with 10 ounces of water, and 0.01 ounce

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A glass was filled with 10 ounces of water, and 0.01 ounce [#permalink]  08 Oct 2012, 01:53
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A glass was filled with 10 ounces of water, and 0.01 ounce of the water evaporated each day during a 20-day period. What percent of the original amount of water evaporated during this period?

(A) 0.002%
(B) 0.02%
(C) 0.2%
(D) 2%
(E) 20%

Practice Questions
Question: 58
Page: 160
Difficulty: 550
[Reveal] Spoiler: OA

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Re: A glass was filled with 10 ounces of water, and 0.01 ounce [#permalink]  08 Oct 2012, 01:53
SOLUTION

A glass was filled with 10 ounces of water, and 0.01 ounce of the water evaporated each day during a 20-day period. What percent of the original amount of water evaporated during this period?

(A) 0.002%
(B) 0.02%
(C) 0.2%
(D) 2%
(E) 20%

In 20 days 20*0.01=0.2 ounces of water evaporated, which is \frac{0.2}{10}*100=2% of the original amount of water.

Answer: D.
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Re: A glass was filled with 10 ounces of water, and 0.01 ounce [#permalink]  08 Oct 2012, 02:03
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Bunuel wrote:
The Official Guide for GMAT® Review, 13th Edition - Quantitative Questions Project

A glass was filled with 10 ounces of water, and 0.01 ounce of the water evaporated each day during a 20-day period. What percent of the original amount of water evaporated during this period?

(A) 0.002%
(B) 0.02%
(C) 0.2%
(D) 2%
(E) 20%

Practice Questions
Question: 58
Page: 160
Difficulty: 600

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[Reveal] Spoiler:
0.01 ounce evaporates each day for twenty days. So totally 0.01 x 20 = 0.2 ounces have evaporated
(0.2/10)*(100) = 2%
Answer is hence D

Although I'm having my doubts since I'm getting the answer to a 600 level question so easily

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Re: A glass was filled with 10 ounces of water, and 0.01 ounce [#permalink]  08 Oct 2012, 02:45
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Amount to water evaporated during 20 days = .01 * 20 = 0.2 ounce
percent of the original amount of water evaporated = .2 * 100/10 = 20/10 = 2%
Answer D
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Re: A glass was filled with 10 ounces of water, and 0.01 ounce [#permalink]  09 Oct 2012, 22:10
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Water evaporated = 0.01 *20 ounce = 0.20 ounce
Original water = 10 ounce
Water evaporated as percentage = 0.20 *100/10 = 2%
Ans D.
Bunuel wrote:
The Official Guide for GMAT® Review, 13th Edition - Quantitative Questions Project

A glass was filled with 10 ounces of water, and 0.01 ounce of the water evaporated each day during a 20-day period. What percent of the original amount of water evaporated during this period?

(A) 0.002%
(B) 0.02%
(C) 0.2%
(D) 2%
(E) 20%

Practice Questions
Question: 58
Page: 160
Difficulty: 600

GMAT Club is introducing a new project: The Official Guide for GMAT® Review, 13th Edition - Quantitative Questions Project

Each week we'll be posting several questions from The Official Guide for GMAT® Review, 13th Edition and then after couple of days we'll provide Official Answer (OA) to them along with a slution.

We'll be glad if you participate in development of this project:
1. Please provide your solutions to the questions;
2. Please vote for the best solutions by pressing Kudos button;
3. Please vote for the questions themselves by pressing Kudos button;
4. Please share your views on difficulty level of the questions, so that we have most precise evaluation.

Thank you!

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Re: A glass was filled with 10 ounces of water, and 0.01 ounce [#permalink]  11 Oct 2012, 03:48
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Before 10 onces

After 0.01 * 20 = 0.2

tranlsate x/100 of 10 = 0.20 -----> 2

D wins
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Re: A glass was filled with 10 ounces of water, and 0.01 ounce [#permalink]  11 Oct 2012, 13:30
SOLUTION

A glass was filled with 10 ounces of water, and 0.01 ounce of the water evaporated each day during a 20-day period. What percent of the original amount of water evaporated during this period?

(A) 0.002%
(B) 0.02%
(C) 0.2%
(D) 2%
(E) 20%

In 20 days 20*0.01=0.2 ounces of water evaporated, which is \frac{0.2}{10}*100=2% of the original amount of water.

Answer: D.

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Re: A glass was filled with 10 ounces of water, and 0.01 ounce [#permalink]  02 May 2013, 10:28
I'm tackling the problem head on with simple math, 10x.01=.10x20=2%

Can someone tell me why they would prefer using fractions opposed to multiplications, for this specific problem.
Re: A glass was filled with 10 ounces of water, and 0.01 ounce   [#permalink] 02 May 2013, 10:28
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# A glass was filled with 10 ounces of water, and 0.01 ounce

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