Fact 1: Jessica has four children<br>Fact 2: Two of the children have blue eyes and two of the children have brown eyes.<br>Fact 3: Half of the children are girls.<br><br>If the first three statements are facts, which of the following statements must also be a fact?<br>I: At least one girl has blue eyes.<br>II: Two of the children are boys.<br>III: The boys have brown eyes.

Correct Answer: II only
Since one-half of the four children are girls, two must be boys. It is not clear which children have blue or brown eyes.