SOLUTION: can someone please help me solve this problem? An arithmetic student needs an average of 70 or more to receive credit for the course. She scored 90, 76, and 66 on the first thr

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Question 47908: can someone please help me solve this problem?
An arithmetic student needs an average of 70 or more to receive credit for the course. She scored 90, 76, and 66 on the first three exams. Write an inequality representing the score she must get on the last test to receive credit for the course.
A) x > 46 B) x >48 C) x > 50 D) x > 53
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Answer by 1980.vikas(7) About Me  (Show Source):
You can put this solution on YOUR website!
According to the question as the average of the 4 test should be greater then 70, so on applying the formula of average and assuming that in 4th test he scored x, we get
=> (x + 90 + 76 + 66)/4 > 70
=> (x + 90 + 76 + 66) > 70*4
=> (x + 232) > 280
=> x > 280 - 232
=> x > 48