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Given that 128+18K=72, fi...

Given that 128+18K=72, find K,

A.

8

B.

16

C.

32

D.

48

Correct answer is C

128+18k=722×64+9×2k=7282+32k=72;112k=72k=72112;k=42;k=42=42×2=16×2;k=32;k=32