Gasoline-oil ratio

The manufacturer of a scooter engine recommends a gasoline-oil fuel mixture ratio of 15 to 1. In a particular garage, we can buy pure gasoline and a gasoline-oil mixture containing 75% gasoline.

How much gasoline and gasoline-oil mix do we need to make 8.0 L of fuel for the scooter engine?

Correct answer:

a =  6 l
b =  2 l

Step-by-step explanation:

a+b = 8.0
(1-0.75) b = 8.0 · (1/(1+15))

a+b = 8.0
(1-0.75)·b = 8.0 · (1/(1+15))

a+b = 8
0.25b = 0.5

b = 0.5/0.25 = 2
a = 8-b = 8-2 = 6

a = 6
b = 2

Our linear equations calculator calculates it.
b=2=2 l

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