SOLUTION: In order to increase the amount of salt in a 40 gram mixture from a 5% to 20% salt, how much salt must be added?

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Question 837555: In order to increase the amount of salt in a 40 gram mixture from a 5% to 20% salt, how much salt must be added?
Answer by lwsshak3(11628) About Me  (Show Source):
You can put this solution on YOUR website!
In order to increase the amount of salt in a 40 gram mixture from a 5% to 20% salt, how much salt must be added?
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let x=amount of salt to add
5%*40+100%x=20%(40+x)
2+x=8+.2x
0.8x=6
x=6/.8
x=7.5
amount of salt to add=7.5 grams