To find out how much further you need to go, you can subtract the depth you've already dug from the total depth indicated on the map.
The total depth is 8 1/2 feet, which can also be expressed as a fraction: \(8 \frac{1}{2} = \frac{17}{2}\) feet.
You have dug 5 feet. To perform the subtraction, it's helpful to express 5 feet as a fraction of the same denominator:
5 feet can be expressed as \( \frac{10}{2} \) feet.
Now, subtract the two:
\[ \frac{17}{2} - \frac{10}{2} = \frac{7}{2} \]
This fraction \( \frac{7}{2} \) can also be converted back to a mixed number:
\[ \frac{7}{2} = 3 \frac{1}{2} \text{ feet.} \]
Therefore, you have to go 3 [] 1/2 [] feet further to reach the treasure.
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