Question

In your​ class, you have scores of 84​, 95​, 83​, and 86 on the first four of five tests. To get a grade of Upper B​, the average of the first five tests scores must be greater than or equal to 80 and less than 90.
a.
Solve an inequality to find the least score you can get on the last test and still earn a Upper B.
b.
What score do you need if the fifth test counts as two​ tests?

Answer 1

a.  To get  a B grade the least average is 80.  That is a total of 5*80 = 400.

So if the least score is x we have;

84 + 95 + 83 + 86 + x ≥ 400

x ≥ 400 -  348

x ≥ 52

so the least score is 52