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Math·Algebra·Linear inequalities in one or two variables

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To earn a bachelor’s degree at a certain university, students are required to complete at least $120$ credit hours. If a student has completed $42$ credit hours, what is the minimum number of additional credit hours the student is required to complete to earn a bachelor’s degree at this university?

A

$162$

B

$120$

C

$78$

D

$20$