Exam Maths Puzzle Percentage

A liter of cream contains 9.5 percent butterfat. How much skim milk containing 5.5 percent butterfat must be added to the mixture to obtain a mixture with 6.5 percent butterfat?

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A train traves 429 miles between two cities. During the first 117 of a trip, the train traveled through mountainous terrain. The train traveled 13 mph slower through mountainous te I have no idea how to solve this problem, my mom needed the help! 6a/35b x 14b/15= 4a/25 please explain how to move the variables and multiply thanx!