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27 Mar 2020, 04:42
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A
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
15%
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Question Stats:
82% (01:23) correct
18%
(02:08)
wrong
based on 146
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A 20 litters mixture of water and spirit contains 10% water. How much water must be added to this mixture to raise the percentage of water to 25%?
A. 4 litters
B. 5 litters
C. 8 litters
D. 30 litters
E. 32 litters
A. 4 litters
B. 5 litters
C. 8 litters
D. 30 litters
E. 32 litters
27 Mar 2020, 04:54
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Now water is 2 L and Spirit 18 L
Let's add x L of water, so
1/4 = (2+x)/(20+x)
x= 4 L
Let's add x L of water, so
1/4 = (2+x)/(20+x)
x= 4 L
Bunuel
27 Mar 2020, 04:56
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Let water to be added is x litres to make the solution have 25% water
therefore, \(\frac{2+x}{20+x} = \frac{25}{100},\)
solving this equation, x = 4.
Lets put this back in the equation to double check if it is indeed the correct answer. If we add 4 litres of water, then percentage of water = \(\frac{2+4}{20+4} = \frac{6}{24} = \frac{1}{4} = 25\) %
Answer: A
therefore, \(\frac{2+x}{20+x} = \frac{25}{100},\)
solving this equation, x = 4.
Lets put this back in the equation to double check if it is indeed the correct answer. If we add 4 litres of water, then percentage of water = \(\frac{2+4}{20+4} = \frac{6}{24} = \frac{1}{4} = 25\) %
Answer: A
