Final answer:
The truthiness of the claim regarding McKinley High's school colors depends on which McKinley High School is being referred to; more context is needed to accurately answer this question.
Step-by-step explanation:
The statement "McKinley High's colors are red, white and silver" could be either true or false. To determine the accuracy of this claim, one would need specific information about the particular McKinley High School in question, as there could be multiple schools with the name McKinley High, each with its own set of school colors. School colors are often selected to represent the school and are used in uniforms, emblems, and merchandise. If this is a question from a textbook, fictional work, or specific school reference, additional context would be necessary to provide a definitive answer.