SOLUTION: How many gallons of a 70% antifreeze solution must be mixed with 70 gallons of 10% antifreeze to get a mixture that is 60% antifreeze?

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Question 959054: How many gallons of a 70% antifreeze solution must be mixed with 70 gallons of 10% antifreeze to get a mixture that is 60% antifreeze?
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
How many gallons of a 70% antifreeze solution must be mixed with 70 gallons of 10% antifreeze to get a mixture that is 60% antifreeze?
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Equation:
alch + alch = alch
0.70x + 0.10*70 = 0.60(x+70)
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70x + 10*70 = 60x + 60*70
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10x = 50*70
x = 5*70
x = 350 gallons (amt. of 70% solution to add)
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Cheers,
Stan H.
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