Python output based question, (elementry lvl),output using user defined function

Question

I am stuck in the logic of the problem and also cannot find the solution for quite long. I am a 12th grader

I am just expecting a detailed solution aur solution at least

def show(x,y,z):
    print(x+y+z)

def now(x,y,z):
    return x*y*z

a=show(6,16,26) 
b=now(2,3,6)
print(a,b)
print(b,a+1) 
print(a+b)