+0  
 
0
338
1
avatar

If John gets a 97 on his next math test, his average will be 90. If he gets 73, his average will be 87. How many tests has John already taken?

 May 7, 2020
 #1
avatar
0

[m*n+97] / (n+1) =90, 

[m*n+73] / (n+1) =87, solve for n, m

 

n = 7 Number of tests before the last one

m = 89 - His average before the 8th and last test.

 May 7, 2020

4 Online Users

avatar
avatar