How much water should be added to 18ml of 10% alcohol solution to reduce to reduce the concentration to 9%

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asked Nov 14, 2015 6.4k views

3 votes

How much water should be added to 18ml of 10% alcohol solution to reduce to reduce the concentration to 9%

Mathematics
high-school

Subham asked

by Subham

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2 Answers

5 votes

18 * 0.1 = 1.8 ml

0.09(x + 18) = 1.8
18 + x = 20
x = 20 - 18
x = 2

2 ml.

Asharajay answered Nov 16, 2015

by Asharajay

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3 votes

$10\%=(10)/(100)=0.1\\\\0.1\cdot18ml=1.8ml-clear\ alcohol\\\\9\%=(9)/(100)=0.09\\\\w-added\ water\ (ml)\\18ml+w-9\%\ alcohol\ solution\\\\0.09(18+w)=1.8\ \ \ \ /:0.09\\18+w=20\ \ \ /-18\\w=2\\\\Answer:2ml.$

Furr answered Nov 19, 2015

by Furr

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