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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book Other Question

Solve the quadratic equation by factoring and applying the property "ab=0 if and only if a=0 or b=0."

(x^2)+4kx=0. A man is 4 times as old as his son. Eighteen years from now, he will be only twice as old as his son. Find their present ages.