book Maths Puzzle Numerical Ability

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

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A square animal pen and a pen shaped like an equilateral triangle have equal perimeters. Find the length of the sides of each pen if the sides of the triangular pen are sixteen les 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?