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Explanation
Correct answer: A.
Choice A is correct. It's given that Shaquan has red cards and blue cards. Therefore, the ratio of red cards to blue cards that Shaquan has is to . This ratio can be reduced by dividing both parts of the ratio by , which yields the ratio to .
Desmos solution:
Note: The expression 7/28 evaluates to 0.25, which matches the simplified ratio 1/4.
Enter in Desmos:
Reviewed and rewritten by CookSAT
Why the other choices are wrong
Choice B
Choice B is incorrect. This is the ratio of blue cards to red cards that Shaquan has.
Choice C
Choice C is incorrect and may result from a calculation error when reducing the ratio.
Choice D
Choice D is incorrect. This may result from finding the ratio of blue cards to red cards, or to , and then making a calculation error when reducing the ratio.