This might help
https://nwsaenglishii.wordpress.com/2013/12/13/dyaspora-by-joanne-hyppolite/
Answer:
A form of "most".
Explanation:
Such as:
Warmest
Coldest
Fastest
: Most warm, Most cold, Most fast.
The sentence is not grammatically correct, it should be, "Last summer, Jim mowed one lawn, now he mows three." Mowed just one lawn doesn't make sense in one sentence.
