Mashaal Masha
Each side of a 30-sided polygon has one of three lengths. The number of sides with length 8 centimeters (cm) is 5 times the number of sides $n$ with length 3 cm. There are 6 sides with length 4 cm. Which equation must be true for the value of $n$?
Difficulty: Hard
A: 

$5n+6=30$

B: 

$6n+6=30$

C: 

$8n+3n+4n=30$

D: 

$8(5n)+3n+4(6)=30$

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