SOLUTION: In a certain class, there are 14 boys and 21 girls. If the average score on an exam is 92 and the boys' average score is 89, what is the girls' average score?
Algebra ->
Customizable Word Problem Solvers
-> Numbers
-> SOLUTION: In a certain class, there are 14 boys and 21 girls. If the average score on an exam is 92 and the boys' average score is 89, what is the girls' average score?
Log On
Question 463418: In a certain class, there are 14 boys and 21 girls. If the average score on an exam is 92 and the boys' average score is 89, what is the girls' average score? Answer by alicealc(293) (Show Source):
You can put this solution on YOUR website! (14 * 89 + 21 * x )/(14 + 21) = 92
(1246 + 21x)/35 = 92
1246 + 21x = 92 * 35
1246 + 21x = 3220
21x = 3220 - 1246
21x = 1974
x = 1974/21 = 94
(