78+20+20+20+20-158+9+9+9+9+9+9 x 0.0000

my teacher ask me this and I got mad!

54

it's actually 45!!

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PEDMAS

78+20+20+20+20-158+9+9+9+9+9+9 x 0.0000
Multiplication is higer priority than addition
=78+20+20+20+20-158+9+9+9+9+9 + 0
Only addition and subtraction remaining which are of equal priority so proceed in order from left to right
= 45

0


Anything multiplied by zero equals zero