book Maths Puzzle Numerical Ability

A 50-gallon barrel of milk is 6% butterfat. How much skim milk (no butterfat) should be mixed to make milk that is 3% butterfat?

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Please help me with polygons i have several different problems and i'm not sure how to do any of them. I have to solve for x? please please please please please please Kerri, Ethan, and Jerry assembled a puzzle together in 40 hours. If Ethan worked twice as fast as Jerry and Kerri worked just as fast as Ethan, then how long would it have taken J