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Mean of Algebraic Terms

SATMAT-JIEFKG

What is the mean of the four values listed below?

$ 20-n $, $ 20 $, $ 20+n $, $ 8n $

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A

$ \cfrac { 15+8n }{ 4 } $

B

$ 15+2n $

C

$ 15+8n $

D

$ 20+2n $