book Maths Puzzle Numerical Ability

a survey of 400 people found that 66 were left handed.what percent of those surveyed were left handed?

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2) -n-9+8n=26
3) 5(w-7)=-15
4) m=3(m-4)=16 I NEED THIS QUESTIONS PLEASE
Find the numerical value of x+4/2x squared +3x + 2 when x = 2