What does this code do? return func(func(x, y), func(x, y))

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))

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In the above piece of code, I'd like to know what does this code:
============================
return func(func(x, y), func(x, y))
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do?

Answer 1

This code has the task to multiply by 2 the return value of a fuction.add function will added 10 and 5 then then add the result by itself ==> result+result