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A solution consists of 30 percent of water by weight. After boiling th

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Bunuel
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A solution consists of 30 percent of water by weight. After boiling th [#permalink] New post  24 Sep 2018, 01:29
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A solution consists of 30 percent of water by weight. After boiling the solution for 15 minutes, 70 percent water, by weight, was evaporated. There is no weight loss for the other part of the solution. What percent of the solution’s total remaining weight consists of the remaining water?


(A) 500/69 %

(B) 600/69 %

(C) 700/79 %

(D) 900/79 %

(E) 100/69 %
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pandeyashwin
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Re: A solution consists of 30 percent of water by weight. After boiling th [#permalink] New post  24 Sep 2018, 01:47
Total = 100 , water = 30.
70% water evaporated , remaining = 9. Total solution = 100-21 = 79
9 * 100 / 79
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ankit9291
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Re: A solution consists of 30 percent of water by weight. After boiling th [#permalink] New post  24 Sep 2018, 04:56
70% of 30% means 21% i.e remaining 79% and 9% of water
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Re: A solution consists of 30 percent of water by weight. After boiling th [#permalink] New post  24 Feb 2020, 04:43
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Bunuel wrote:
A solution consists of 30 percent of water by weight. After boiling the solution for 15 minutes, 70 percent water, by weight, was evaporated. There is no weight loss for the other part of the solution. What percent of the solution’s total remaining weight consists of the remaining water?


(A) 500/69 %

(B) 600/69 %

(C) 700/79 %

(D) 900/79 %

(E) 100/69 %


Solution


    • Let us assume that total weight of the solution is 100 units.
      o So, weight of the water = 30 units
      o And, weight of the other part of solution \(= (100 – 30 ) = 70\) units,
    • Since, 70% water is evaporated. So remaining water = 30% of 30 units \(= \frac{30*30}{100} = 9\) units.
    • Thus, the required percentage = (weight of remaining water/ total weight of remaining solution) \(* 100 = \frac{9}{(70+9)}*100 = \frac{900}{79}\)
Thus, the correct answer is Option D.
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Re: A solution consists of 30 percent of water by weight. After boiling th [#permalink] New post  03 Sep 2021, 12:18
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Re: A solution consists of 30 percent of water by weight. After boiling th [#permalink]
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