book Maths Puzzle Numerical Ability

can you solve the equation m=500+.10x1200 and l=200+20x1200 thanks.

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book Other Question

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? Can you show me the steps to get the answer for this problem.--- The problem as follows:

7x+3+10x

Thank you,
Candace