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Mandy wants to earn a​ 90% overall average in her mathematics class. She has grades of 87​, 77​, and 94 thus far in the course. What grade does Mandy need to average on the next two assessments to earn a​ 90% overall​ average?

It says to round to the nearest whole numbers as needed

 Apr 21, 2019
 #1
avatar+106533 
+1

Easy to solve these

 

She  currently has    87 + 77 + 94  =  258 points

 

She needs  5(90)  =  450 points  for a "90"  average

 

So....on the next two tests....she needs   450 - 258   =  192  points

 

So....she needs to average   192 / 2  =   96  on the next two tests

 

 

 

 

cool cool cool

 Apr 21, 2019
 #2
avatar+128 
-2

First, multiply 90 by 5 to get 450. Next, evaluate 450-87-77-94. That gets us a total of 192. After that, divide that by 2 to get the average total grade needed to get a 90% average.

 

Mandy needs to get an average of 96% on her 2 tests to get a 90% average on her 5 tests.

 

~~Hypotenuisance

 Apr 21, 2019

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