SOLUTION: Calculate how much 10% salt solution and 50% salt solution must be mixed to end up with exactly 20 gallons of a 40% salt solution.

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Question 637133: Calculate how much 10% salt solution and 50% salt solution must be mixed to end up with exactly 20 gallons of a 40% salt solution.
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
Calculate how much 10% salt solution and 50% salt solution must be mixed to end up with exactly 20 gallons of a 40% salt solution.
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Equation:
salt + salt = salt
0.10x + 0.50(20-x) = 0.40*20
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Multiply thru by 100 to get:
10x + 50*20 - 50x = 40*20
-40x = -10*20
x = 5 gallons (amt. of 10% solution needed)
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20-x = 15 gallons (amt. of 50% solution needed)
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Cheers,
Stan H.
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