NEW HERE? LEARN MORE
closeclose
Last visit was: 11 May 2024, 23:55 It is currently 11 May 2024, 23:55
Decision Tracker
My Rewards
New posts
New comers' posts

Close
GMAT Club Daily Prep
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.
Go to My Error Log Learn more
Close
Request Expert Reply
Confirm Cancel

A large watermelon weighs 20 kg with 96% of its weight being water. I

SORT BY:
Date
Kudos
Tags:
Find Similar Topics 
Show Tags
Hide Tags
User avatar
D
cfc198
CAT Forum Moderator
Joined: 29 Nov 2018
Posts: 261
Own Kudos [?]: 588 [16]
Given Kudos: 50
Concentration: Marketing, Strategy
Send PM
A large watermelon weighs 20 kg with 96% of its weight being water. I [#permalink] New post   02 Mar 2019, 09:52
14
Bookmarks
00:00
A
B
C
D
E

Difficulty:

75% (hard)

Question Stats:

54% (02:00) correct 46% (02:08) wrong based on 196 sessions
Hide Show timer Statistics
A large watermelon weighs 20 kg with 96% of its weight being water. It is allowed to stand in the sun for a while and some of the water evaporates so that now only 95% of it is water. Its
reduced weight will be?

1. 16 kg
2. 19.2 kg
3. 18 kg
4. 19.8 kg
5. 19 kg
ShowHide Answer
Official Answer
A
Most Helpful Reply
User avatar
D
GMATGuruNY
Tutor
Joined: 04 Aug 2010
Posts: 1321
Own Kudos [?]: 3157 [11]
Given Kudos: 9
Schools:Dartmouth College
Send PM
Re: A large watermelon weighs 20 kg with 96% of its weight being water. I [#permalink] New post   02 Mar 2019, 10:27
6
Kudos
4
Bookmarks
Expert Reply
cfc198 wrote:
A large watermelon weighs 20 kg with 96% of its weight being water. It is allowed to stand in the sun for a while and some of the water evaporates so that now only 95% of it is water. Its
reduced weight will be?

1. 16 kg
2. 19.2 kg
3. 18 kg
4. 19.8 kg
5. 19 kg


Since 96% of the 20 kg watermelon is water, 4% of the 20 kg is non-water:
\((0.04)(20) = 0.8\) kg

Since 95% of the post-evaporation watermelon is water, the remaining 5% must be composed of the 0.8 kg of non-water:
\(0.05x = 0.8\)
\(x = \frac{0.8}{0.05} = \frac{80}{5} = 16\) kg
Show Spoiler
A
General Discussion
User avatar
G
lucajava
Manager
Manager
Joined: 21 Feb 2019
Posts: 69
Own Kudos [?]: 296 [0]
Given Kudos: 67
Location: Italy
Send PM
A large watermelon weighs 20 kg with 96% of its weight being water. I [#permalink] New post   02 Mar 2019, 12:00
Water: \(\frac{96}{100}(20) = 19,2\)

Loss of weight is due to loss of water. Then we can set:
\(19,2 - x = \frac{95}{100}(20-x)\)
\(19,2 - x = \frac{19}{20}(20-x)\)
\(19,2 - x = 19 - \frac{19}{20}x\)
\(0,2 = \frac{1}{20}x\)
\(x = 4\)

New weight: \(20 - 4 = 16\)
User avatar
D
exc4libur
SVP
SVP
Joined: 24 Nov 2016
Posts: 1720
Own Kudos [?]: 1346 [0]
Given Kudos: 607
Location: United States
Send PM
Re: A large watermelon weighs 20 kg with 96% of its weight being water. I [#permalink] New post   21 Aug 2019, 09:23
cfc198 wrote:
A large watermelon weighs 20 kg with 96% of its weight being water. It is allowed to stand in the sun for a while and some of the water evaporates so that now only 95% of it is water. Its
reduced weight will be?

1. 16 kg
2. 19.2 kg
3. 18 kg
4. 19.8 kg
5. 19 kg


initial melon: 4%
final melon: 5%
initial weight: 20kg
water that evaporated: x
final weight: 20-x

5%=4%(initial/[final=initial-x])… 5%=4%(20/20-x)… 20(1%)=5%x… 20(1%)/5%=x… x=20(1)/5=4
final weight: 20-(4)=16

Answer (A)
User avatar
L
Kinshook
GMAT Club Legend
GMAT Club Legend
Joined: 03 Jun 2019
Posts: 5347
Own Kudos [?]: 3999 [2]
Given Kudos: 160
Location: India
Schools: HBS '22 CBS '22 Wharton '22
GMAT 1: 690 Q50 V34
WE:Engineering (Transportation)
Send PM
Reviews Badge Forum Quiz Mode
Re: A large watermelon weighs 20 kg with 96% of its weight being water. I [#permalink] New post   21 Aug 2019, 09:32
2
Kudos
cfc198 wrote:
A large watermelon weighs 20 kg with 96% of its weight being water. It is allowed to stand in the sun for a while and some of the water evaporates so that now only 95% of it is water. Its
reduced weight will be?

1. 16 kg
2. 19.2 kg
3. 18 kg
4. 19.8 kg
5. 19 kg


Given:
1. A large watermelon weighs 20 kg with 96% of its weight being water.
2. It is allowed to stand in the sun for a while and some of the water evaporates so that now only 95% of it is water.

Asked: Its reduced weight will be?

Let the reduced weight be x kg
20*4% = .8 kg = Non-water portion of watermelon
5% x =.8 kg
x = .8/5% = 16 kg

IMO A
User avatar
L
CrackverbalGMAT
GMAT Club Legend
GMAT Club Legend
Joined: 03 Oct 2013
Affiliations: CrackVerbal
Posts: 4944
Own Kudos [?]: 7655 [0]
Given Kudos: 216
Location: India
Send PM
Re: A large watermelon weighs 20 kg with 96% of its weight being water. I [#permalink] New post   15 Nov 2021, 03:18
Top Contributor
A large watermelon weighs 20 kg with 96% of its weight being water. It is allowed to stand in the sun for a while and some of the water evaporates so that now only 95% of it is water. Its reduced weight will be?

Water % of a large water melon is 20 % and the remaining 4 % will be the solid part.

The new weight of the water melon be X kg ( water is 95 % and solid is 5 %) after keeping in the sun.Even though some of the water evaporates , the solid part will remain the same.

4 % of 20 = 5 % of X

4* 20 = 5 *X
X = 4 *4 = 16 kg

Option A

Thanks,
Clifin J Francis,
GMAT SME
User avatar
bumpbot
Non-Human User
Joined: 09 Sep 2013
Posts: 32945
Own Kudos [?]: 828 [0]
Given Kudos: 0
Send PM
Re: A large watermelon weighs 20 kg with 96% of its weight being water. I [#permalink] New post   04 Oct 2023, 18:35
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.
GMAT Club Bot
gmatclubot
Re: A large watermelon weighs 20 kg with 96% of its weight being water. I [#permalink]
04 Oct 2023, 18:35
Moderators:
Bunuel
Math Expert
93161 posts
yashikaaggarwal
Senior Moderator - Masters Forum
3137 posts

Powered by phpBB © phpBB Group | Emoji artwork provided by EmojiOne
Main navigation
GMAT Resources
Partners
MBA Resources
www.gmac.com|www.mba.com | | GMAT Club Rules | Terms and Conditions