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Re: Shuaib has 20 ounces of 20% salt solution. How much water sh [#permalink]
Emdad wrote:
Shuaib has 20 ounces of 20% salt solution. How much water should be evaporated to make it a 30% solution?
(A) 12.67
(B) 6.67
(C) 5.67
(D) 10
(E) none of these

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20x+ 80x = 20
=> x=0.2

let 80 y be the amount of water to be evaporated then

20x / 20X + 80 (x-y) = 30 /100
=> 4/ 20 -80y = 3/10
=> y=12

Therefore 80/12 = 6.67 therefore IMO B
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Re: Shuaib has 20 ounces of 20% salt solution. How much water sh [#permalink]
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\(\frac{4}{20-x}=\frac{3}{10}\)

40=60-3x
X=20/3
X=6,67

20% of 20 is 4. Because the quantity we need to take off is just water, we substract the amount X only from the denominator. Then equal to 30% which is equal to 3/10
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Re: Shuaib has 20 ounces of 20% salt solution. How much water sh [#permalink]
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