Question

To get a B in​ math, Alexandria Pappas must average 80 on five tests. Scores on the first four tests were 82​,74​,82​,and 74.What is the lowest score that she can get on the last test and still get a​ B?

Answer 1

88 score.

Explanation:

Given:

To get a B in​ math, Alexandria Pappas must average 80 on five tests.

Scores on the first four tests were 82​, 74​, 82​, and 74.

Question asked:

What is the lowest score that she can get on the last test and still get a​ B?

Solution:

Let lowest score she can get on the last test =
`x`

As we know:

`Average=(Sum\ of \ observations)/(Number\ of\ observations)\\ \\ 80=(82+74+82+74+x)/(5) \\ \\`

By cross multiplication:-

`80*5=312+x \\ \\400=312+x\\Subtracting\ both\ sides\ by\ 312\\400-312=312-312+x\\88=x`

Thus, she can get 88 score on the last test to get a B in​ math.