A
B
C
D
Explanation
Correct answer: A.
Choice A is correct. It's given that of the marbles in a container are red. Therefore, the number of red marbles can be calculated by multiplying the number of marbles in the container by , which gives , or .
Desmos solution:
Note: The expression 10% of 320 directly computes the number of red marbles.
Enter in Desmos:
Reviewed and rewritten by CookSAT
Why the other choices are wrong
Choice B
Choice B is incorrect. This is the number of marbles in the container that aren't red.
Choice C
Choice C is incorrect. This is the total number of marbles in the container.
Choice D
Choice D is incorrect and may result from conceptual or calculation errors.