How will Python evaluate the following expression ?

(20 + 30) * 40

How will Python evaluate the following expression ?

15.0 / 4 + (8 + 3.0)

Find out the error(s) in following code fragment:

a = 30
b=a+b
print (a And b)

Find out the error(s) in following code fragment:

a, b, c = 2, 8, 9
print (a, b, c)
c, b, a = a, b, c
print (a ; b ; c)