book Maths Puzzle Numerical Ability

15. Adult tickets for a play cost $16 and child tickets cost $9. If there were 24 people at a performance and the theater collected $258 from ticket sales, how many children attended the play?

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please show me how this goes i dont know where to get the square root sign so i key it in this way (4x square root 3)^2-(3)^3 thank you can you solve the equation m=500+.10x1200 and l=200+20x1200 thanks.