SOLUTION: Beth has the following grades 81%, 88%, 90% 86% on her first four math quizzes. What grade would she need on her next math quiz to have an average of a B (87-90)?

Algebra ->  Coordinate Systems and Linear Equations  -> Linear Equations and Systems Word Problems -> SOLUTION: Beth has the following grades 81%, 88%, 90% 86% on her first four math quizzes. What grade would she need on her next math quiz to have an average of a B (87-90)?       Log On


   

Question 409072: Beth has the following grades 81%, 88%, 90% 86% on her first four math quizzes. What grade would she need on her next math quiz to have an average of a B (87-90)?
Answer by rfer(16322) About Me  (Show Source):
You can put this solution on YOUR website!
(81+88+90+86+x)/5=87
345+x=87*5
x=435-345
x=>90