A principal used a total of flags that were either blue or yellow for field day. The principal used blue flags. How many yellow flags were used?
Correct answer: A
Explanation
Choice A is correct. It's given that a principal used a total of blue flags and yellow flags. It's also given that of the flags used, flags were blue. Subtracting the number of blue flags used from the total number of flags used results in the number of yellow flags used. It follows that the number of yellow flags used is , or .
Choice B is incorrect. This is the number of blue flags used.
Choice C is incorrect. This is the total number of flags used.
Choice D is incorrect and may result from conceptual or calculation errors.
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