SOLUTION: How many gallons of rocket fuel containing 80% liquid oxygen must be mixed with 250 gallons containing 40% liquid oxygen to produce a mixture containing 70% oxygen?

Question 667423: How many gallons of rocket fuel containing 80% liquid oxygen must be mixed with 250 gallons containing 40% liquid oxygen to produce a mixture containing 70% oxygen?
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
How many gallons of rocket fuel containing 80% liquid oxygen must be mixed with 250 gallons containing 40% liquid oxygen to produce a mixture containing 70% oxygen?
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Equation:
ox + ox = ox
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0.80x + 0.40*250 = 0.70(x+250)
----
80x + 40*250 = 70x + 70*250
10x = 30*250
x = (1/3)(250)
x = 83 1/3 (amt of 80% liq ox needed)
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Cheers
Stan H.
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