exam Maths Puzzle Numerical Ability

Please help me solve this problem 9-5(-7x+5)

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exam Other Question

1. the sum of three consecutive odd numbers is 39. <-- do not solve 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%