exam Maths Puzzle Numerical Ability

How many gallons of 32% solution must be mixed with 70 gallons of 47% solution to obtain a 42% solution?

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exam Other Question

the length of a leg of a right triangle is two times the length of the other, and the hypotenuse is 25.What is the length of the longer leg? Find the slope of a line that is perpendicular to the line connecting the points (6, 12) and (3, 5).