book Maths Puzzle Numerical Ability

2) -n-9+8n=26
3) 5(w-7)=-15
4) m=3(m-4)=16 I NEED THIS QUESTIONS PLEASE

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book Other Question

I am having trouble with the following equasion.

(P-100)/((p+100)/2)=.111

Any help is greatly appreciated. a survey of 400 people found that 66 were left handed.what percent of those surveyed were left handed?