Question 50664
An arithmetic student needs an average of 70 or more to receive credit for the course. She scored 72, 61, and 71 on the first three exams. Write an inequality representing the score she must get on the last test to receive credit for the course.
let her marks i test 4 = x
total marks in 4 exams=72+61+71+x=204+x
average=(x+204)/4
average required=70
(x+204)/4>=70
x+204>=70*4=280
x>=280-204=76
x>=76