Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.

Customized for You

we will pick new questions that match your level based on your Timer History

Track Your Progress

every week, we’ll send you an estimated GMAT score based on your performance

Practice Pays

we will pick new questions that match your level based on your Timer History

Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.

It appears that you are browsing the GMAT Club forum unregistered!

Signing up is free, quick, and confidential.
Join other 500,000 members and get the full benefits of GMAT Club

Registration gives you:

Tests

Take 11 tests and quizzes from GMAT Club and leading GMAT prep companies such as Manhattan GMAT,
Knewton, and others. All are free for GMAT Club members.

Applicant Stats

View detailed applicant stats such as GPA, GMAT score, work experience, location, application
status, and more

Books/Downloads

Download thousands of study notes,
question collections, GMAT Club’s
Grammar and Math books.
All are free!

Thank you for using the timer!
We noticed you are actually not timing your practice. Click the START button first next time you use the timer.
There are many benefits to timing your practice, including:

Fresh dates contain 90% water while dry dates contain 28% water . How many kg of dry dates can be obtained from 36kg of fresh dates ?

A. 5Kg B. 10Kg C. 12 Kg D. 6Kg

36 kilograms of fresh dates contain 0.1*36=3.6 kilograms of non-water.

Dry dates obtained from these fresh dates will contain the same amount of non-water and we are told that this amount should be 72% of the dry dates, thus x*0.72=3.6 --> x=5 kilograms.

Re: Fresh dates contain 90% water while dry dates contain 28% [#permalink]

Show Tags

02 May 2013, 21:03

2

This post received KUDOS

prat29 wrote:

Fresh dates contain 90% water while dry dates contain 28% water . How many kg of dry dates can be obtained from 36kg of fresh dates ?

A. 5Kg B. 10Kg C. 12 Kg D. 6Kg

Given information can be rephrased as " Fresh dates contain 10% fruit while dry dates contain 72% fruit"

Hence 36 Kg of fresh dates contain 10% of 36 = 3.6 Kg of fruit. This same amount of fruit is present after the dates are dried. If we assume the mass of the dry dates obtained as x Kg, then 72% of x = 3.6 \(0.72*x = 3.6\) Hence x = 5 Kg Option A is the correct answer

Fresh dates contain 90% water while dry dates contain 28% water . How many kg of dry dates can be obtained from 36kg of fresh dates ?

A. 5Kg B. 10Kg C. 12 Kg D. 6Kg

Responding to a pm:

Personally, I would use the method used by Bunuel above. But if you insist on using the "alligation method" which we call "scale method", here is how you can do it:

What two things are mixed to give the third? Dry dates are mixed with water to give fresh dates.

Dry dates have 28% water, water is 100% water and fresh dates have 90% water.

Dry dates/water = w1/w2 = (A2 - Aavg)/(Aavg - A1) = (100 - 90)/(90 - 28) = 10/62 = 5/31 Mixing 5 kg of dry dates with 31 kg (to maintain consistency) of water will give you 36 kg of fresh dates.

Re: Fresh dates contain 90% water while dry dates contain 28% [#permalink]

Show Tags

14 Jul 2013, 00:02

1

This post received KUDOS

Fresh dates 36 kg = 90% water and 10% pure dates part. So pure dates part= 36 *0.1= 3.6 kg pure date. Dry dates say x kg = 28% water and 72% pure dates part. So pure dates part= x *0.72= 0.72x kg pure date.

Equate the pure dates part only, since that quantity is same in both mixture,so 0.72 x = 3.6 x= 3.6/0.72 = 360/72 = 5 kg. Ans A

Fresh dates contain 90% water while dry dates contain 28% water . How many kg of dry dates can be obtained from 36kg of fresh dates ?

A. 5Kg B. 10Kg C. 12 Kg D. 6Kg

1. Non-water percentage of fresh grapes and dry grapes are 10% and 72% resp i.e., 7.2 times more in the dry grapes 2. So from 36 kg fresh grapes we can obtain 36/7.2 = 5 kg of dry grapes.
_________________

Re: Fresh dates contain 90% water while dry dates contain 28% [#permalink]

Show Tags

23 Jul 2014, 08:53

prat29 wrote:

Fresh dates contain 90% water while dry dates contain 28% water . How many kg of dry dates can be obtained from 36kg of fresh dates ?

A. 5Kg B. 10Kg C. 12 Kg D. 6Kg

Just wanted to chip in my 2 cents for the question…

Since a fresh date is 10% non-water and a dry date is 72% non-water then the ratio of non-water for the dry date to the non-water for the fresh date is 10/72 or 5/36. Meaning that for every 36 units of non-water in a fresh date there is 5 units of non-water in the dry date. Hence A

Weight of elements in 36 kg (fresh dates) water=32.4 kg, other- 3.6 kg To make dry dates out of it some water has to be removed . Let it be x. Weight (dry dates) water = 32.4 -x, other - 3.6 kg Proportion of elements(dry dates) water = 28, other -72

(32.4 -x) / 3.6 = 28/72

From which we can find weight of water to be 1.4 kg and therefore total weight of dry dates = 5 kg.
_________________

I tried solving the other way round i.e by equating % of water amount.

0.9 * 36 = 0.28 * d. This doesn't result in 5 kg weight. Why wouldn't this work? Please clarify.

You cannot equate these two because the amount of water is not equal in these two cases. You get dry dates by removing water from fresh dates.
_________________

Re: Fresh dates contain 90% water while dry dates contain 28% [#permalink]

Show Tags

18 Mar 2017, 04:48

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.
_________________