SOLUTION: How much water must be evaporated from 80 pounds of a 12% solution of salt in order to obtain a 20% solution? Complete solution please, thank you!

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Question 1158867: How much water must be evaporated from 80 pounds of a 12% solution of salt in order to obtain a 20% solution?
Complete solution please, thank you!
Found 3 solutions by josgarithmetic, greenestamps, ikleyn:
Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
If evaporating x pounds of water,
%2812%2A80%29%2F%2880-x%29=20

%2880-x%29%2F%2812%2A80%29=1%2F20

80-x=%2812%2A80%29%2F20=12%2A4=48

80-x=48

x=80-48

highlight%28x=32%29

Answer by greenestamps(13200) About Me  (Show Source):
You can put this solution on YOUR website!


The amount of salt is 12% of 80 pounds, which is 9.6 pounds.

You want those 9.6 pounds to be 20% of the final solution:

9.6+=+.20%28x%29
x+=+9.6%2F.20+=+48

The final solution needs to be 48 pounds; it originally was 80 pounds, so 32 pounds of water needs to be evaporated.

Answer by ikleyn(52784) About Me  (Show Source):
You can put this solution on YOUR website!
.

It was solved yesterday under this link

https://www.algebra.com/algebra/homework/word/mixtures/Mixture_Word_Problems.faq.question.1158751.html

https://www.algebra.com/algebra/homework/word/mixtures/Mixture_Word_Problems.faq.question.1158751.html