Can anybody explain this function to me?

Question

Can anyone explain to me this coding function?

def apply_twice(func, arg):
return func(func(arg))
def add_five(x):
return x + 5
print(apply_twice(add_five, 10))

Output is 20

Thank you in advance!!

Answer 1

1.) add_five does 10 + 5 -> 15
2.) apply_twice repeats 1.): 15 + 5 -> 20

Answer 2

apply_twice(add_five,10)) = add_five(add_five(10)) = add_five(15) = 20