exam Maths Puzzle Numerical Ability

How much of a liquid with a 30% alchohol content and how much of a liquid with a 100% alcohol content should be added to end up with 42 milliiters of with a 50% alcohol content?

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Hi May I have help with this problem?

Draw the parallelogram with verticies A(8, 5), B(17, 5), C(12, 10), and D(21, 10) on a coordinate plane. Find the area of the rectangle The difference between the length and the width of a rectangle is 7 centimeters. Find the dimensions of the rectangle if its perimeter is 50 centimeters.