Turn a constant rate into a total

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Math

A machine seals $45$ packages in $5$ minutes at a constant rate. At this rate, how many packages does the machine seal in $8$ minutes?

Select one answer.

45

72

80

360

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Answer: B ( $72$ )

The machine seals $45 \div 5=9$ packages per minute. In $8$ minutes, the machine seals $9 \times 8=72$ packages.

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