Why 30?

Question

Explain, please, on your fingers, why the output is 30.
https://code.sololearn.com/cDcb4tGHpD1i/?ref=app

Answer 1

func( func(x, y), func(x, y) )
add( add(5, 10), add(5, 10) )
add(5, 10) = 15
add(15, 15)
15 + 15 = 30

Answer 2

Михаил , there are nested functions in this example. The result comes after replacing add(add(5, 10), add(5, 10)) => add(15, 15) => 30.

Answer 3

Your x and y takes the value of the sum of a and b which is 5+10= 15.
So "x+y" gives 15+15= 30.

Answer 4

Rawley Bagon ,thanks so much

Answer 5

TheWh¡teCat 🇧🇬 thanks