SOLUTION: a student has grades of 76,84,73 and 88 of four of the five unit tests in a course. let x represent the grade on the fifth test. this must be a whole number. an average of more tha

Algebra ->  Expressions-with-variables -> SOLUTION: a student has grades of 76,84,73 and 88 of four of the five unit tests in a course. let x represent the grade on the fifth test. this must be a whole number. an average of more tha      Log On


   

Question 213736: a student has grades of 76,84,73 and 88 of four of the five unit tests in a course. let x represent the grade on the fifth test. this must be a whole number. an average of more than 80 is desired.
a)write an inequality using x to represent the fifth test
b)solve the inequality
c)what is the lowest grade the student needs in order to have an average of more than 80.
Answer by user_dude2008(1862) About Me  (Show Source):
You can put this solution on YOUR website!
a)

(76+84+73+88+x)/5 > 80

b)

(76+84+73+88+x)/5 > 80

(321+x)/5 > 80

321+x > 80*5

321+x > 400

x > 79

solution: x > 79

c)

Lowest grade is 79.