SOLUTION: How much water must be evaporated from 240 gallons of a 3% salt solution to produce a 5% salt solution?

Question 1208970: How much water must be evaporated from 240 gallons of a 3% salt solution to produce a 5% salt solution?

Found 2 solutions by ikleyn, greenestamps:
Answer by ikleyn(52776)   (Show Source): You can put this solution on YOUR website!
.

It was solved at this forum many years ago under this link

https://www.algebra.com/algebra/homework/word/mixtures/Mixture_Word_Problems.faq.question.160147.html

https://www.algebra.com/algebra/homework/word/mixtures/Mixture_Word_Problems.faq.question.160147.html

                    Enjoy ( ! )

Answer by greenestamps(13198)   (Show Source): You can put this solution on YOUR website!

A different approach to solving the problem than the one shown in the link provided by the other tutor....

The salt is 3% of the 240 gallons, or 7.2 gallons.

When water is evaporated, the amount of salt remains at 7.2 gallons.

If the solution is to be 5% salt, those 7.2 gallons need to be 5% of the solution, so the new total amount of the solution needs to be 7.2/0.05 = 144.

Since the original solution was 240 gallons and the new solution is 144 gallons, the number of gallons of water that needed to be evaporated is 240-144 = 96.

ANSWER: 96 gallons

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