book Maths Puzzle Numerical Ability

there were 429 people at a play. admission was $1 for adults and $0.75 for children. the receits were $372.50. how many adults and how many children attended the play?

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How many diagonls can be drawn from each vertex of a decagon? well im doing this mcas problem because we get one each week and i wanted to know... How do you find Volume in cubic feet? and how do u find the total surface area?