book Maths Puzzle Numerical Ability

What is the median of the following list of numbers? 4, 5, 7, 9, 10, 12

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book Other Question

What is the pattern in the names of polygons...polygons that have 11 - 50 sides?

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Alissa 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?