Can you explain the process of the functional programm

Question

https://code.sololearn.com/cIzOJ9VIfjU4/?ref=app

Answer 1

Basically, the apply_twice function doubles the application of a function passed as one of the arguments.

So you get: add_five(add_five(10))

Since add_five does just that (adds 5), you get: ((10+5)+5), which is 20.

Answer 2

Thank you.