exam Maths Puzzle Numerical Ability

how do you solve 30-n=20+3(n+2)

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A committe at your school is planning for graduation. You have been asked to research the cost of renting chairs for the ceremony. You do not yet know how many chairs you will need Given two lines whose equations are 3x+y-8 =0 and -2x+by+9 =0, determine the value of b such that the two lines will be perpendicular.
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