Question 1094323
The average score for a class of 30 students was 75. 
The 20 male students in the class averaged 70.
 What's the average score for the Female students?  
:
let a = the average score of the girls of which there are 30 - 20 = 10
:
{{{((20(70)+ 10a))/30}}} = 75
1400 + 10a = 30(75)
10a = 2250 - 1400
a = {{{850/10}}}
a = 85 is average score for the girls