Exam Maths Puzzle Time Distance and Speed

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

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(2x-3)(x+5)=6 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?