exam Maths Puzzle Numerical Ability

A car uses 3 gallons of gasoline on a trip of 39 miles. At that rate, how much gasoline will a trip of 65 miles require?Help me please?

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PLease help to solve for c :

x = p(1/a + m/c Combining functions. I have to find f over g. f(x)=4x(squared)-19x-63,g(x)=x-7. How do I factor the numerator?