francheskaleffler francheskaleffler

09-10-2018
Mathematics

contestada

The average score that Kat gets on her exams is proportional to the amount of time she studies for the exam. Kat scored a 75 after studying for 15 hours. How many hours should she study for the next exam if she needs a 90 to pass the class?

Respuesta :

moony29 moony29

09-10-2018

75/15=90/x
75x=90*15
75x=1350
x=1350/75
x=18
she needed to study 18 hrs to get a 90

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