# Josh scores 75, 60, and 94, on the first 3 exams. If his 4th exam score is 10/9 of the average of...

## Question:

Josh scores 75, 60, and 94, on the first 3 exams. If his 4th exam score is 10/9 of the average of the first three, what does he have to score in the next two in order to average an 85 on the exam?

## Average

It is the ratio of the sum of total data to the to total number of data. From a set of n data, average can be formulated as:

$$Average =\ \dfrac{Sum\ of\ data}{Number\ of\ data}$$

$$Average\ =\ \dfrac{x_1 + x_2 + x_3. .. . . x_n }{n}$$

$$Average =\ \dfrac{\Sigma_{x=1}^n x}{n}$$

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The scores of first three exams are : {eq}75,\ 60,\ and\ 94 {/eq}

Average of first three exams:

Average =\ \dfrac{Sum\ of\ data}{Number\ of\...