SOLUTION: how many liters of 75% gas and 90% gas would you need for 1200 liters of 85% gas?

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Question 229250: how many liters of 75% gas and 90% gas would you need for 1200 liters of 85% gas?
Answer by checkley77(12844) About Me  (Show Source):
You can put this solution on YOUR website!
.90x+.75(1,200-x)=.85*1,200
.90x+900-.75x=1,020
.15x=1,020-900
.15x=120
x=120/.15
x=800 liters of 90% gas is used.
1,200-800=400 liters of 75% gas is used.
Proof:
.90*800+.75*400=1,020
720+300=1,020
1,020=1,020