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Math·Algebra·Linear equations in one variable

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A manufacturer produces a total of 100 parts. The number of 9-inch parts is 4 times the number $n$ of 8-inch parts. The number of 3-inch parts is 15.

Which equation represents this situation?

A

$9(4n)+8n+3(15)=100$

B

$9n+8n+3n=100$

C

$4n+15=100$

D

$5n+15=100$