book Maths Puzzle Numerical Ability

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?

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book Other Question

Linear and Quadratic functions???
f:x-x+1
How many diagonls can be drawn from each vertex of a decagon?