book Maths Puzzle Numerical Ability

A survey of 2,000 people showed 1,620 favored the construction of a new fire station. What percent of the people surveyed did not favor the construction of the fire station?

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book Other Question
3-6(x+3)=33 Let y = sqrt((x+1)(x+3)/(x+2).)Find all the real values of x for which y takes real
values.