exam Maths Puzzle Numerical Ability

Four of the angles of a pentagon have measures 30, 70, 120, and 165. Find the measure of the fifth angle. Please show how it is done.

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Hi. May I have some help with the following inequality?

Solve the nonlinear inequality. Express the solution using interval notation and graph the solution set.
x(2-3x)< 0 Use a system of equations to solve each problem

13. Adult tickets for the school musical sold for $3.50 and student tickets sold for $2.50. 321 tickets were sold altogether for $937.50. How many of each kind of ticket were sold?