SOLUTION: A storage tank contains 120 Litera of fuel which is 3% oil (97%) gasoline. How many Liters of oil should be added for use in an engine that requires a 10% oil mixture?

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Question 1004907: A storage tank contains 120 Litera of fuel which is 3% oil (97%) gasoline. How many Liters of oil should be added for use in an engine that requires a 10% oil mixture?
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
Let +x+ = liters of oil to be added
+.03%2A120+=+3.6+
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+%28+x+%2B+3.6+%29%2F%28+x+%2B+120+%29+=+.1+
+x+%2B+3.6+=+.1%2A%28+x+%2B+120+%29+
+x+%2B+3.6+=+.1x+%2B+12+
+.9x+=+8.4+
+x+=+9.333+
9 and 1/3 liters of oil should be added
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check:
+%28+x+%2B+3.6+%29%2F%28+x+%2B+120+%29+=+.1+
+%28+9.333+%2B+3.6+%29%2F%28+9.333+%2B+120+%29+=+.1+
+12.933+%2F+129.333+=+.1+
+12.933+=+12.933+
OK