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Math·Algebra·Linear equations in one variable

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A candle is made of $18$ ounces of wax. When the candle is burning, the amount of wax in the candle decreases by $1$ ounce every $4$ hours. If $8$ ounces of wax remain in this candle, for how many hours has it been burning?

A

$3$

B

$7$

C

$32$

D

$40$