6 divided by 1/4 = 24 + 12 divided by 1/4 = 48, then 48 + 24 = 72
Step-by-step explanation:
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Use the formula for the volume of a sphere:

There is your answer!
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Answer:
C. 12/15
Step-by-step explanation:
2/3, 6/9, and 18/27 all simplify to 2/3. 12/15 does not.