Jose's math grade is the mean of his three exams. His grades of the first two exams were 82 and 93. What grade must he earn on his third exam to have of at least 90 for the class?

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asked Oct 28, 2018 102k views

5 votes

Jose's math grade is the mean of his three exams. His grades of the first two exams were 82 and 93. What grade must he earn on his third exam to have of at least 90 for the class?

Mathematics
middle-school

Pavel Murygin asked

by Pavel Murygin

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2 Answers

4 votes

98
because ..
82+93+98=273
273/3=91

Michael Krussel answered Oct 30, 2018

by Michael Krussel

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5 votes

So we let the mark of his third exam be x
(82+93+x)/3=90
Multiply both sides by 3
82+93+x=270
x=93

Johan Walhout answered Nov 2, 2018

by Johan Walhout

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