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

Solve the system of equation. If the system is consistent, state the coordinates of the point of intersection. If not consistent, state whether it is inconsistent of dependent.

x-y=3
2x+3y=11 find two consecutive even numbers whose product is 288