SOLUTION: How many gallons of a 2% salt solution must be mixed with 30 gallons of a 7% solution to obtain a 5% solution? 0.02x + 30(0.07) = x-30(0.05)

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Question 345541: How many gallons of a 2% salt solution must be mixed with 30 gallons of a 7% solution to obtain a 5% solution?

0.02x + 30(0.07) = x-30(0.05)
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
The solution volumes add, not subtract, so the right hand side volume should be x%2B30.
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0.02x+%2B+30%280.07%29+=+%280.05%29%28x%2B30%29
Multiply both sides by 100.
2x%2B210=5x%2B150
Now solve for x.