Simplify the sum of known values:
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- \]Question: A mammalogist tracks the daily food consumption (in grams) of five endangered voles over a period: 12, 15, $x$, 18, and 21. If the average consumption is 16 grams, what is the value of $x$?
- Solution: The average of the five values is given by
- \frac{12 + 15 + x + 18 + 21}{5} = 16.
- + 15 + 18 + 21 = 66,
- \frac{66 + x}{5} = 16.
- Multiply both sides by 5:
