motor's oil is 1-to-15 mix of oil to gas; find liters in 20L  TOPIC_SOLVED

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motor's oil is 1-to-15 mix of oil to gas; find liters in 20L

Postby rick on Mon Sep 13, 2010 5:30 am

How do I solve this word problem? One type of motor requires a mixture of oil and gasoline in a ratio of 1 to 15 (that is, 1 part of oil to 15 parts of gasoline). How many liters of each are contained in a 20-liter mixture? :confused:
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Re: motor's oil is 1-to-15 mix of oil to gas; find liters in  TOPIC_SOLVED

Postby artichoke on Fri Oct 29, 2010 11:36 pm

x = amount of oil
y = amount of gasoline

x+y = 20
x/y = 1/15

solve, e.g.

second equation is x = y/15.

then first equation is y/15 + y = 20

solve for y then x.
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