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Math·Algebra·Linear equations in one variable

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During hibernation, American black bears do not eat or replenish calories. A certain black bear weighed $258$ pounds when entering hibernation and lost weight at a mean rate of $0.8$ pounds per day. At this rate, how many days after entering hibernation would the black bear weigh $210$ pounds?

A

$39$

B

$48$

C

$60$

D

$168$