# Nate has scores of 85, 91, 89, and 93 on four tests. What is the least number of points he can get on the fifth test to have an average of at least 90?

##### 1 Answer

Dec 13, 2016

#### Answer:

#### Explanation:

Let

Then his average score will be:

#(85+91+89+93+x)/5 = (358+x)/5#

We want this to satisfy:

#(358+x)/5 >= 90#

Multiply both sides by

#358+x >= 450#

Subtract

#x >= 92#

So Nate needs at least