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(16-x)

.32 = .64 - .04x

.04x = -.32

x = 8

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