To find the total loss of deliveries over the three months, you need to sum the losses from each month:
- August: 16 deliveries
- September: 9 deliveries
- October: 6 deliveries
Now, add these numbers together:
\[ 16 + 9 + 6 \]
Calculating this step-by-step:
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First, add 16 and 9: \[ 16 + 9 = 25 \]
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Then add the result to 6: \[ 25 + 6 = 31 \]
Thus, the total loss of deliveries over the three months is \(\boxed{31}\).