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

Question

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

GMATGuruNY · Accepted Answer

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
 A

lucajava · Answer

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

exc4libur · Answer

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

5%=4%(initial/ )… 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)

Kinshook · Answer

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

CrackverbalGMAT · Answer

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

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

jsam98 · Answer

ppl searching for why not 95/100 * 20 , its coz weight changes as water evaporated and changed weights 95% needs to be considered

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

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

Prep Toolkit

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