exam Maths Puzzle Numerical Ability

How many gallons of 94-octane gasoline should be mixed with 400 gallons of 99-octane gasoline to obtain a mixture that is 97-octane?

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exam Other Question

One number is 12 more than another. The sum of the smaller number and twice the larger is 39. Find the larger number. Find the equation of the line.
Slope -1/3 y-intercept (0,3/2)

The problem is I do not know how to begin solving it could you give me the steps or an example of this problem with using same method but different numbers.