Try the following GMAT Problem Solving question that tests your understanding of the averages (arithmetic mean).
Question 38:
The Dunbar family consists of a mother, a father, and some children. The average age of the members of the family is $20$, the father is $48$ years old, and the average age of the mother and children is $16$. How many children are in the family?
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$\quad 2$
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$\quad 3$
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$\quad 4$
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$\quad 5$
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$\quad 6$
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