book Maths Puzzle Numerical Ability

How many diagonls can be drawn from each vertex of a decagon?

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book Other Question

Chaundra is two years older then her brother. She is four years younger then her older sister. Her two parents are each forty-one. The total of all five ages is one hundred twenty-three. How old is Chaundra? 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?