exam Maths Puzzle Numerical Ability

How much pure alcohol must be added to 40 oz of a 25%
solution to produce a mixture that is 40% alcohol?

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exam Other Question

Find the volume of a pyramid with height 18 feet and a base area of 81 square. lines p and q intersect to form adjacent angles 1 and 2. if measurement of angle 1 = 3x+18 and mearsurement of angle 2 = -8y-70, find the values of x and y so that p is perpendicular to q.