exam Maths Puzzle Numerical Ability

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Ron will rent a car for the weekend. He can choose one of two payment plans. The first plan costs for two days plus cents per mile. The second pl

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f(x)=√x-1

^^ its f(x)= [square root] x-1

THANK YOU! Adult tickets for a play cost $20 and child tickets cost $16. If there were 27 people at a performance and the theater collected $646 from ticket sales, how many adults and how many children attended the play?