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i dont know what im missing
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03 Jan 2017, 11:44
03 Jan 2017, 11:44
00:00
Question Stats:
50% (02:06) correct
50% (00:00) wrong based on 2 sessions
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in 750 gram of mixture of salt and water , there is 30% of water. how much water should be converted to steam so that water in the mix remains 25%?
i think the answer should be 11.25
bcas, 225gms is 30% of 750gms. 5% of 225gms is 11.25gms which should be evoporated.
But the answer is 50gms.
what am i missing?
Brief me, if tthere is a concept behind this.
thanks.
i think the answer should be 11.25
bcas, 225gms is 30% of 750gms. 5% of 225gms is 11.25gms which should be evoporated.
But the answer is 50gms.
what am i missing?
Brief me, if tthere is a concept behind this.
thanks.
Re: i dont know what im missing
[#permalink]
03 Jan 2017, 13:40
03 Jan 2017, 13:40
2
Expert Reply
ssiva wrote:
in 750 gram of mixture of salt and water , there is 30% of water. how much water should be converted to steam so that water in the mix remains 25%?
i think the answer should be 11.25
bcas, 225gms is 30% of 750gms. 5% of 225gms is 11.25gms which should be evoporated.
But the answer is 50gms.
what am i missing?
Brief me, if tthere is a concept behind this.
thanks.
i think the answer should be 11.25
bcas, 225gms is 30% of 750gms. 5% of 225gms is 11.25gms which should be evoporated.
But the answer is 50gms.
what am i missing?
Brief me, if tthere is a concept behind this.
thanks.
Hi,
Rule: PERCENTAGES are not your friends
Now given that 750 gms of water contains 30% water or \(\frac{30}{100}\times 750\) grams of water or \(225\) grams of water.
Let x grams of water be evaporated such that the solution now contains 25% water.
\(\frac{225 - x}{750 -x}=25%\).
or \(\frac{225 - x}{750 -x}=\frac{1}{4}\).
or \((225 -x)\times 4 = 750 -x\).
or \(3x = 150\) or \(x=50\) gms
Hence 50 grams of water needs to be evaporated.
Re: i dont know what im missing
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27 Oct 2021, 18:03
27 Oct 2021, 18:03
Hello from the GRE Prep Club BumpBot!
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Thanks to another GRE Prep 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.
