Each of the cucumbers in 100 pounds of cucumbers is composed : GMAT Problem Solving (PS)
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# Each of the cucumbers in 100 pounds of cucumbers is composed

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Each of the cucumbers in 100 pounds of cucumbers is composed [#permalink]

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06 Oct 2010, 10:52
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Each of the cucumbers in 100 pounds of cucumbers is composed of 99% water, by weight. After some of the water evaporates, the cucumbers are now 98% water by weight. What is the new weight of the cucumbers, in pounds?

A. 2
B. 50
C. 92
D. 96
E. 98
[Reveal] Spoiler: OA

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Last edited by Bunuel on 12 Apr 2012, 09:49, edited 1 time in total.
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06 Oct 2010, 11:01
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shrive555 wrote:
Each of the cucumbers in 100 pounds of cucumbers is composed of 99% water, by weight. After some of the water evaporates, the cucumbers are now 98% water by weight. What is the new weight of the cucumbers, in pounds?

* 2
* 50
* 92
* 96
* 98

Any other approach to solve this question
Thanks

Out of 100 pounds 99% or 99 pounds is water and 1 pound is non-water. After some water evaporates the cucumbers become 98% water and 2% of non-water, so now 1 pound of non-water composes 2% of cucucmbers, which means that the new weight of cucumbers is 1/0.02=50 pounds.

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06 Oct 2010, 16:43
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My approach

Before evaporation by weight

100 pounds of Cucumber = 99 pounds water + 1 pound cucumber matter

After evaporation

lets say the weight of cucumber is x
then by weight

x = (98/100* x is water) + 1 pound of cucumber matter

solving for x gives 50
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08 Oct 2010, 01:45
Nice explanation Bunuel
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30 Jan 2011, 10:43
Hi Bunnel,
Would it be possible explain your solution? For some reason I am not getting it that how cucumber will be 50 pound after reduction of 1% water.
Thanks
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30 Jan 2011, 11:20
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vibhutirs wrote:
Hi Bunnel,
Would it be possible explain your solution? For some reason I am not getting it that how cucumber will be 50 pound after reduction of 1% water.
Thanks

Before some of the water evaporates: 100 pounds of cucumbers is composed of 99% water (= 99 pounds of water) AND 1% non-water (= 1 pound of non-water);

After some of the water evaporates: 98% water by weight AND the same 1 pound of non-water, which did not evaporate. This 1 pound of non-water now composes 100%-98%=2% of the total weight of cucumbers. So, 1 pound = 2% of the total weight of cucumbers --> total weight of cucumbers = 1/0.02 = 50 pounds.

Hope it's clear.
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Re: Each of the cucumbers in 100 pounds of cucumbers is composed [#permalink]

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12 May 2012, 01:57
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shrive555 wrote:
Each of the cucumbers in 100 pounds of cucumbers is composed of 99% water, by weight. After some of the water evaporates, the cucumbers are now 98% water by weight. What is the new weight of the cucumbers, in pounds?

A. 2
B. 50
C. 92
D. 96
E. 98

Responding to a pm:

There are two ways of getting to the answer here.

Method 1:
Let's go forward to back. Say we have 98% mixture (2% pure cucumber extract and 98% water). Say, we also have plain water (100% water). If we mix these two, we get 100 pounds of 99% mixture (1% pure cucumber extract and 99% water). We want to find the amount of pure water that was mixed. (Usually, we are given two components and we have to mix them. This question does the opposite. It separates out the components of the mixture but overall it doesn't matter to us at all.)

w1/w2 = (A2 - Aavg)/(Aavg - A1) = (100 - 99)/(99 - 98) = 1/1

The 98% mixture and the pure water must have been mixed in 1:1 ratio. Since total mixture is 100 pounds, the amount of pure water must be 50 pounds and the 98% mixture must have been 50 pounds.

Method 2:
Another way to think about this problem: The amount of pure cucumber extract stays the same. Only the amount of water reduces. The amount of pure cucumber extract was 1 pound in the 99% mixture and it stayed 1 pound in the 98% mixture.
In 100 pounds of 99% cucumber mix, this pure cucumber extract was 1% and in 98% cucumber mix, this same pure cucumber extract was 2% of the cucumber mix.

Say, the total weight of 98% cucumber mix is x pounds.
1 pound = (2/100)*x
x = 50 pounds

The answer is a little un-intuitive since you don't expect so much water to disappear to just make it go down from 99% to 98% but instead, think that you need to make the amount of pure cucumber extract to go up from 1% to 2% i.e. you need it to double in proportion. For the same amount (1 pound) to be double in proportion, you need to reduce the total weight by half.
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Get started with Veritas Prep GMAT On Demand for $199 Veritas Prep Reviews Math Expert Joined: 02 Sep 2009 Posts: 36548 Followers: 7078 Kudos [?]: 93133 [0], given: 10552 Re: Each of the cucumbers in 100 pounds of cucumbers is composed [#permalink] ### Show Tags 13 Jun 2013, 02:09 Expert's post 1 This post was BOOKMARKED Bumping for review and further discussion*. Get a kudos point for an alternative solution! *New project from GMAT Club!!! Check HERE All DS Mixture Problems to practice: search.php?search_id=tag&tag_id=43 All PS Mixture Problems to practice: search.php?search_id=tag&tag_id=114 _________________ Director Joined: 03 Aug 2012 Posts: 916 Concentration: General Management, General Management GMAT 1: 630 Q47 V29 GMAT 2: 680 Q50 V32 GPA: 3.7 WE: Information Technology (Investment Banking) Followers: 23 Kudos [?]: 691 [2] , given: 322 Re: Each of the cucumbers in 100 pounds of cucumbers is composed [#permalink] ### Show Tags 18 Apr 2014, 22:02 2 This post received KUDOS I don't think any formula is needed in such questions. It is pure logic which governs these questions. Approach: When one thing is getting replaced or removed just CONCENTRATE on the CONCENTRATION of that thing. Concentrate here on 'Water' 99 Pounds = Water 1 pound = non water Let X be evaporated so that concentration changes to 98% 99 - X = Water in new thing = 98% of total 99-X = 98/100 (100 - X) X=50 _________________ Rgds, TGC! _____________________________________________________________________ I Assisted You => KUDOS Please _____________________________________________________________________________ Veritas Prep GMAT Instructor Joined: 16 Oct 2010 Posts: 7121 Location: Pune, India Followers: 2134 Kudos [?]: 13641 [0], given: 222 Re: Each of the cucumbers in 100 pounds of cucumbers is composed [#permalink] ### Show Tags 20 Apr 2014, 19:55 TGC wrote: I don't think any formula is needed in such questions. It is pure logic which governs these questions. Approach: When one thing is getting replaced or removed just CONCENTRATE on the CONCENTRATION of that thing. Concentrate here on 'Water' 99 Pounds = Water 1 pound = non water Let X be evaporated so that concentration changes to 98% 99 - X = Water in new thing = 98% of total 99-X = 98/100 (100 - X) X=50 Actually, it is easier to concentrate on the thing that does not change. See approach 2 above. But whatever works for you! _________________ Karishma Veritas Prep | GMAT Instructor My Blog Get started with Veritas Prep GMAT On Demand for$199

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27 May 2014, 13:30
VeritasPrepKarishma wrote:
shrive555 wrote:
Each of the cucumbers in 100 pounds of cucumbers is composed of 99% water, by weight. After some of the water evaporates, the cucumbers are now 98% water by weight. What is the new weight of the cucumbers, in pounds?

A. 2
B. 50
C. 92
D. 96
E. 98

w1/w2 = (A2 - Aavg)/(Aavg - A1) = (100 - 99)/(99 - 98) = 1/1

Hi Karishma,

how did you get to the right side of "1/1"?
Why did you state that both of the weights are the same?
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27 May 2014, 20:03
ronr34 wrote:
VeritasPrepKarishma wrote:
shrive555 wrote:
Each of the cucumbers in 100 pounds of cucumbers is composed of 99% water, by weight. After some of the water evaporates, the cucumbers are now 98% water by weight. What is the new weight of the cucumbers, in pounds?

A. 2
B. 50
C. 92
D. 96
E. 98

w1/w2 = (A2 - Aavg)/(Aavg - A1) = (100 - 99)/(99 - 98) = 1/1

Hi Karishma,

how did you get to the right side of "1/1"?
Why did you state that both of the weights are the same?

The cucumbers left after some water has evaporated is 98% water. The evaporated water is 100% water.
These two were mixed together in the original 100 pounds of cucumber. The original 100 pounds of cucumbers had 99% water.

The formula of the scale method gives us:
So w1/w2 = (A2 - Aavg)/(Aavg - A1)
A1 - Water concentration of cucumber leftover = 98%
A2 - Water concentration of pure water = 100%
w1 - weight of cucumber leftover
w2 - weight of water

w1/w2 = (100 - 99)/(99 - 98) = 1/1

So we can say that the weight of cucumber leftover and weight of water should be the same i.e. they both must be 50 pounds each.

If you are unsure of this formula, check: http://www.veritasprep.com/blog/2011/03 ... -averages/
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Get started with Veritas Prep GMAT On Demand for $199 Veritas Prep Reviews Intern Joined: 28 May 2014 Posts: 3 Followers: 0 Kudos [?]: 0 [0], given: 1 Re: Each of the cucumbers in 100 pounds of cucumbers is composed [#permalink] ### Show Tags 28 May 2014, 10:24 1 portion is non water ---- 99 portions are water 1% 99% now after vaporization The 1 portion became 2% ------> we have to calculate 1 is 2% of what? x * 0.02= 1 ----> x= 100/2 ----> x=50 "the new whole. hope this one is simple enough! Senior Manager Joined: 17 Sep 2013 Posts: 394 Concentration: Strategy, General Management GMAT 1: 730 Q51 V38 WE: Analyst (Consulting) Followers: 19 Kudos [?]: 270 [0], given: 139 Re: Each of the cucumbers in 100 pounds of cucumbers is composed [#permalink] ### Show Tags 18 Jul 2014, 10:47 My 2 cents on mixtures and allegations.. Always deal with the quantity that does not change.. Mass content here does not change..hence play with this info Say Water is added to milk...Content of milk does not change..play with milk info.. _________________ Appreciate the efforts...KUDOS for all Don't let an extra chromosome get you down.. Senior Manager Joined: 17 Dec 2012 Posts: 447 Location: India Followers: 26 Kudos [?]: 395 [0], given: 14 Each of the cucumbers in 100 pounds of cucumbers is composed [#permalink] ### Show Tags 19 Jul 2014, 04:57 weight - 99-x (water), 1(other) ratio - 98(water), 2(other) (99-x)/1 = 98/2 x=50 i.e, 50 pounds of water evaporates Remaining is 50 pounds. _________________ Srinivasan Vaidyaraman Sravna http://www.sravnatestprep.com Classroom and Online Coaching Manager Status: folding sleeves up Joined: 26 Apr 2013 Posts: 157 Location: India Concentration: Finance, Strategy GMAT 1: 530 Q39 V23 GMAT 2: 560 Q42 V26 GPA: 3.5 WE: Consulting (Computer Hardware) Followers: 1 Kudos [?]: 85 [0], given: 39 Re: Each of the cucumbers in 100 pounds of cucumbers is composed [#permalink] ### Show Tags 10 Sep 2014, 13:16 shrive555 wrote: Each of the cucumbers in 100 pounds of cucumbers is composed of 99% water, by weight. After some of the water evaporates, the cucumbers are now 98% water by weight. What is the new weight of the cucumbers, in pounds? A. 2 B. 50 C. 92 D. 96 E. 98 Sol: 100-x/x =1/1 2x= 100 x=50 Director Joined: 23 Jan 2013 Posts: 579 Schools: Cambridge'16 Followers: 1 Kudos [?]: 42 [0], given: 40 Re: Each of the cucumbers in 100 pounds of cucumbers is composed [#permalink] ### Show Tags 23 Oct 2014, 07:25 Logically: We should concentrate on non-water component as not changing in number 1% of non-water ---> 2% of non-water doubling the concentration that can be only if we halve the total weight, so 100/2=50 Algebraic: (99-x/100-x)*100=98 100=2x x=50, so 100-50=50 B Intern Joined: 04 Jul 2014 Posts: 48 Schools: Smeal Followers: 0 Kudos [?]: 27 [0], given: 40 Re: Each of the cucumbers in 100 pounds of cucumbers is composed [#permalink] ### Show Tags 23 Oct 2014, 19:28 100 pounds of cucumbers have 99 pounds water and 1 pound solid. Now 1 pound solid is 2% of the total cucumber weight. So 98% of the cucumber which is water is 49 pounds. [ 2% -> 1 what is 98% ? ......98% is 49] Therefore the total cucumber weight is 50 pounds. GMAT Club Legend Joined: 09 Sep 2013 Posts: 13441 Followers: 575 Kudos [?]: 163 [0], given: 0 Re: Each of the cucumbers in 100 pounds of cucumbers is composed [#permalink] ### Show Tags 27 Oct 2015, 04:10 Hello from the GMAT Club BumpBot! Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos). Want to see all other topics I dig out? Follow me (click follow button on profile). You will receive a summary of all topics I bump in your profile area as well as via email. _________________ VP Joined: 08 Jul 2010 Posts: 1443 Location: India GMAT: INSIGHT WE: Education (Education) Followers: 68 Kudos [?]: 1407 [1] , given: 42 Re: Each of the cucumbers in 100 pounds of cucumbers is composed [#permalink] ### Show Tags 27 Oct 2015, 05:50 1 This post received KUDOS Expert's post shrive555 wrote: Each of the cucumbers in 100 pounds of cucumbers is composed of 99% water, by weight. After some of the water evaporates, the cucumbers are now 98% water by weight. What is the new weight of the cucumbers, in pounds? A. 2 B. 50 C. 92 D. 96 E. 98 100 pound cucumber Haas 99% water I.e. 1% is the pulp in it On water evaporation, pulp remains same I.e. 1 pound pulp now should serve the purpose of 2% of total weight of leftover cucumber now because in new weight water is 98%. 1 pound = (2/100)*New weight I.e. New Weight = 50 Pound Answer : Option B _________________ Prosper!!! GMATinsight Bhoopendra Singh and Dr.Sushma Jha e-mail: info@GMATinsight.com Call us : +91-9999687183 / 9891333772 http://www.GMATinsight.com/testimonials.html Feel free to give a Kudos if it is a useful post . Re: Each of the cucumbers in 100 pounds of cucumbers is composed [#permalink] 27 Oct 2015, 05:50 Go to page 1 2 Next [ 24 posts ] Similar topics Replies Last post Similar Topics: If the set S is composed of the following numbers {99, 100, 100, 105, 2 15 Aug 2016, 03:03 If 34 boxes of cucumbers in brine cost A dollars, how much will B boxe 2 04 Jul 2016, 08:03 6 A wholesaler wishes to sell 100 pounds of mixed nuts at$2.50 a pound. 8 26 Nov 2014, 06:45
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