SOLUTION: there is 100 kids in class taking the test 80% is average for the boys 70% is average for the girls the average of the class is 76% how many girls are in the class
Algebra ->
Probability-and-statistics
-> SOLUTION: there is 100 kids in class taking the test 80% is average for the boys 70% is average for the girls the average of the class is 76% how many girls are in the class
Log On
Question 422094: there is 100 kids in class taking the test 80% is average for the boys 70% is average for the girls the average of the class is 76% how many girls are in the class Answer by ankor@dixie-net.com(22740) (Show Source):
You can put this solution on YOUR website! there is 100 kids in class taking the test
80% is average for the boys 70% is average for the girls
the average of the class is 76% how many girls are in the class
:
Let x = no. of girls in the class
then
(100-x) = no. of boys in the class
: = 76
Multiply by 100
80(100-x) + 70x = 100(76)
8000 - 80x + 70x = 7600
-80x + 70x = 7600 - 8000
-10x = -400
x =
x = +40 girls
:
:
Check solution, (60 boys, obviously) = = 76
