Latest self Aptitude Question SOLUTION: Fresh grapes contain 90% water when they are dried they turn into resins containing 20% water . Find how many kg of resins can be obtained from 20kg of fresh grapes

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Fresh grapes contain 90% water when they are dried they turn into resins containing 20% water . Find how many kg of resins can be obtained from 20kg of fresh grapes

Aparajita Chowdhury (12 years ago)

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Dr.Dipin Singh  (12 years ago)

2.5 kg

In 100 kg fresh grapes , we have 90 kg water and 10 kg solid material.
From 100 kg fresh grapes, we get 10 kg solid material as such with 2.5 kg water which is 20% of 12.5 kg resins.
so from 20 kg fresh grapes, we get 20* 12.5/100 = 2.5 kg resin

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santanu  (11 years ago)

same pattern :

Fresh grapes contain 90% of their wt as water, alrite. so wt of water in fresh 20 kg grape would be:

( 20/100) * 90 = 18 kg.

So the dry wt of grapes is 2 kg. This dry wt is not going to go watever you do with it.

now what would be the wt of dried grapes which contain 20% of water by wt?

suppose the total wt of dry grapes is W...

W= dry weight of grapes + 20% of W

=> W = 2kg + (W/100) * 20

=> W =2 kg + W/5

=> 2kg = W - W/5 = (5W - W)/5

=> 4W/5 = 2kg

=> W =(2*5)/4 =5/2 kg i.e. 2.5 kg
now the waight of water in dry grapes is 20 % of total weight which is 2.5 kg, so the wt of water would be:

wt of water= 20% of W= (W/100) * 20 = W/5 = 2.5/5 =(5/2)/5 = 5/ (2*5) = 5/10 = 0.5 kg

so the wt of water in dry grapes would be 0.5 kg...

I know this will help...
Source(s):
http://Mayajaal.co.cc

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Madhurima ghosal  (7 years ago)

20*10/80= 25 kg..
From one grave we can get 1/8 resin as one grape contains 10% of what resin needs 80%.

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Madhurima ghosal  (7 years ago)

There was a calculation mistake in the previous one.
10*20/80= 2.5

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