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Mathematical reasoning

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Phil and Phyllis are siblings. Phyllis has twice as many brothers as she has sisters. Phil has the same number of brothers as sisters. How many girls and how many boys are in the family?

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Solution Summary

This shows how to complete a mathematical reasoning problem regarding siblings.

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Suppose there are x girls and y boys in the family.
Let's analyse the conditions.
1. Phil and Phyllis are siblings. So they can be boys or girls.
2. Phyllis has twice as many brothers as she has sisters. "she" is used in this statement. So we know that Phyllis is a girl. So she has y ...

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