Posted by Cassandra on Monday, March 17, 2014 at 4:52pm.
Please, I need your help!How much water must be evaporated from 16oz of a 2% salt solution to make a 4% salt solution?

College Algebra  Steve, Monday, March 17, 2014 at 5:12pm
twice the concentration means half the volume, since the same amount of salt remains.
So, we lost half of 16 oz, or ?

College Algebra  Reiny, Monday, March 17, 2014 at 5:13pm
by intuition, it must be 8 oz
or
the amount of salt must stay the same, so
.02(16) = .04(16x)
.32 = .64  .04x
.04x = .32
x = 8
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