<PRE><B>Question 1038251</B>
 In a class there are 20 females and 50 males with the average of given examination 75.
 if females averaged 60 in an examination, find the mean examination for the male student. 
:
let m = the average for the male students
{{{(50m + 20(60))/70}}} = 75
multiply both sides by 70
50m + 1200 = 75(70)
50m = 5250 - 1200
50m = 4050
m = 4050/50
m = 81 is the average for male students
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