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Julia made 7 batches of cookies and ate 3 cookies. There were 74 cookies left. Which expression can be used to determine the average number of cookies per batch?
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The average number of cookies per batch is $10$

Explanation:

Let the number of cookies in a batch be $x$, then it means that we can formulate the equation:

$7x-3=74$

Solving for $x$ gives:

$7x=74-3$

$7x=71$

$x=10.1428...$

Cookies cannot be fractional so we consider the whole part only.

$\therefore x=10$

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