can anyone explain this

Question

def add(x, y):
return x + y

def do_twice(func, x, y):
return func(func(x, y), func(x, y))

a = 5
b = 10

print(do_twice(add, a, b))

Answer 1

def add(x, y):
return x + y
Return the sum of the two values passed

def do_twice(func, x, y):
return func(func(x, y), func(x, y))

func wil be equal to add because of the values passed so you could write this as:
return add(add(5,10), add(5,10))

after the function is called:
return add(15,15)

Tye answer should be 30