I want to write a sentence with a similar structure as follows:
Alice bought 12 apples, 1 banana and 6 cantaloupes.
Should the numbers be written with letters or digits? The sentence is just an example, I'm interested for any context, e.g. in academic writing.
I believe that typically integers strictly smaller than 10 should be written with letters while integers strictly greater than 9 should be written with letters, but in this case that would result in a mix of letter and digits, which don't seem consistent within the sentence.