exam Maths Puzzle Numerical Ability

Suppose a chemist is mixing two acid solutions, one of 20% concentration and the other of 30% concentration.Which one of the following concentrations could not be obtaioned?

A. 22% B. 24% C. 28% D. 32%

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exam Other Question
Given a= x(^1/2)-4x(^-1/2). What is the value of 1/a^-2??? The area of a parallelogram is 24.96 cm squared. The base is 6.4 cm. If the measures of the base and height are each doubles, find the area of the resulting parallelogram.