Problema Solution
sam has grades of 91, 93, and 81 on his first three science exams. if he wants an average of at least 84 after his fourth test, what are the possible scores he can earn on his fourth test
Answer provided by our tutors
Let the score in the 4th test be x.
Then to get an average of atleast 84, we have
(91+93+81+x)/4 >= 84
=> 265 + x = 84*4 >= 336
=> x = 336-265 >= 71.
So the final score must be more than or equal to 71.