(6-4)/5x100=
First take mind in PEMDAS or do the equation in the order of parenthesis, exponents, multiplication, division, addition, subtraction.
So first parenthesis or (6-4)=2
2/5x100
There are no exponents, so now we must do the multiplication or 5x100=500
2/500
now we do division or 2/500=0.004
There-forth the answer is actually 0.004 and not "40"