Answer:
D. n/3+9=21
Explanation:
Translate words to numbers-
Quotient of a number, n and 3: n/3
"And 9": Add 9
Is 21: =21
(n/3)+9=21
D.
9 more means +9 and the quotient of is dividing the unknown number and 3 the unknown value goes on top because it is larger than the 3.
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