How can I get 20?

Question

def apply_twice(func, arg):
return func(func(arg))

def add_five(x):
return x + 5

print(apply_twice(add_five, 10))

Answer 1

apply_twice(add_five, 10)
= add_five(add_five(10))
= add_five(10 + 5)
= add_five(15)
= 15 + 5
= 20

Answer 2

When you pass add_five and 10 to the function apply_twice
Then func acts the same as apply_twice function and arg as 10
So, func(func(arg)) is equivalent to add_five(add_five(10))
Which means:-
add_five(10+5)#add_five function called once
Or
add_five(15)#add_five function called second time
Which is equal to 15+5=20
So, output is 20

Answer 3

thank you

Answer 4

Sorry slight mistake, just correct ed:)