exam Maths Puzzle Numerical Ability

How many gallons of a 28% solution must be mixed with a 63% solution to obtain 100 gals. of 37% solution?

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exam Other Question

In rectangle ABCD, side AB=6, side BC=9, and diagonal AC is drawn. Find angle CAD to the nearest degree.
A circle centered at the point of origin has a radius of 10. If the point (10,0) is rotated 120 degrees counter-clockwise, determine the coordinates of the new point in exact radical form.