bartlettlily69 bartlettlily69

17-04-2021
Mathematics

contestada

A machine can grade 30 tests in 2 minutes. At this rate, how long will it take the machine to grade 135 tests?

8 minutes

9 minutes

10 minutes

12 minutes

Respuesta :

haybuckets8 haybuckets8

17-04-2021

ANSWER: 9 minutes

WHY:

30/2= 15 so 15 tests per minute

135/15=9 so nine minutes for 135 tests

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