SOLUTION: a chemist has one solution that is 20% saline and a second that is 65% saline. How many gallons of each should be mixed together to get 120 gallons of a solution that is 50% saline

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Question 940989: a chemist has one solution that is 20% saline and a second that is 65% saline. How many gallons of each should be mixed together to get 120 gallons of a solution that is 50% saline.
Found 2 solutions by josgarithmetic, Alan3354:
Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
and a second that is 65% saline.
?

Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
a chemist has one solution that is 20% saline and a second that is 65% saline. How many gallons of each should be mixed together to get 120 gallons of a solution that is 50% saline.
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t = 20%
s = 65%
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t + s = 120 (total solution)
20t + 65s = 120*50 (total salt)
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Solve for t & s