Book Maths Puzzle Age Problem

Kim is 15. Kim's Dad is 39. How many years will pass until dad is 2 times kim's age.

Answer is : 9 years will pass, Kim will be 24, and dad will be 48, But how to solve?

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Book Other Question
A 50-gallon barrel of milk is 6% butterfat. How much skim milk (no butterfat)should be mixed to make milk that is is 3% butterfat? A rectangle ia 4.5 inches long and 1.2 inches wide finds it's parimeter.
Option
(a) 11.4 in
(c) 5.4 in
(b) 5.7 in
(d)54 in