There are 30 students in Jenna's class. Jenna brought in 13 cupcakes. Which equation can be used to find the number of cupcakes the class still needs (n) so that everyone will get one?

A.

13 + n = 30

B.

30 + n = 13

C.

13 * n = 30

D.

30 : 13 = n

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