Answer:
I think 5 of the 15 deliveries are plants.
Explanation:
I divided 6 by 18 to get 3.4 (I rounded up), which translates to 34%. 34% of 15 is 5.1, I rounded to get 5.
I checked my work by getting 34% of 18, which is 6.12 and would round to 6.
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