Question

What will James need to score on his 4 test to have an average of 85?

Answer 1

Step-by-step explanation

We are asked to find the score James needs to have on his 4th test to have an average of 85

Let his fourth score be x

Next, we will use the formula

`Average=\frac{sum\text{ of scores}}{number\text{ of tests}}`

In our case, the total number of tests is 4

The sum of scores is

`73+80+88+x`

The average is 85

So, solving for x

`\begin{gathered} 85=(73+80+88+x)/(4) \\ \\ 85=(241+x)/(4) \end{gathered}`

Solving for x

`\begin{gathered} 241+x=85*4 \\ 241+x=340 \\ x=340-241 \\ x=99 \end{gathered}`

Therefore, James has to score 99 in his fourth test to have an average of 85