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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(3/4-2/3)+(1/2+1/3)

What is the dominator of this fraction and why? I have been trying to solve this question but I cant figure it out: The sum of the present ages of Eric and his father is 58 years. In 10 years, his father will be twice as old as Eric will be at that time. Find their present ages.