exam Maths Puzzle Numerical Ability

Sales tax varies directly with the cost of an item. If you pay a $6 sales tax on a $150 coat, what is the sales tax on a $45 pair of shoes?

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solve the equation:
tan Xdegrees =0.8 for 0 degrees =less than x degrees equals less than 360 degrees. Adult tickets for a play cost $17 and child tickets cost $2. If there were 22 people at a performance and the theater collected $179 from ticket sales, how many adults and how many children attended the play?