SOLUTION: 120 liters of fuel, containing 3% oil, is available for a certain 2-cycle engine. this fuel is used for another engine requiring 10% oil mixture. how many liters of oil must be add

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Question 777800: 120 liters of fuel, containing 3% oil, is available for a certain 2-cycle engine. this fuel is used for another engine requiring 10% oil mixture. how many liters of oil must be added?
Answer by lwsshak3(11628) About Me  (Show Source):
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120 liters of fuel, containing 3% oil, is available for a certain 2-cycle engine. this fuel is used for another engine requiring 10% oil mixture. how many liters of oil must be added?
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let x=amount of oil must be added
..
3%(120)+100%x=10%(120+x)
3.6+x=12+.10x
.90x=8.4
x=28/3
amount of oil must be added=28/3 liters