grandh01 wrote:How much water must be added to
10 gallons of 10% brine solution
to decrease the concentration to 7%?
1) 0---1.5gal
2) 1.5---3gal
3) 3-----4.5gal
4) 4.5----6gal
5) 6+
OA IS C
Brine is a solution of salt and water.
Since only water is to be ADDED, the amount of SALT in the original solution -- 1 gallon -- will not change.
Thus, for the resulting solution to be 7% brine, 1 gallon of salt must constitute 7% of the new total:
1 = (7/100)t
t = 100/7.
Amount of water added = new total - old total = 100/7 - 10 = 30/7 = 4 + 2/7.
The correct answer is
C.
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