Question

{[(120+2•15):75+4]•10²-40•5}:80=

Answer 1

{[(120+2*15):75+4]*10²-40*5}:80= 
{[(120+30):75+4]*100-200}:80= 
[(150:75+4)*100-200]:80= 
[(2+4)*100-200]:80= 
(6*100-200):80= 
(600-200):80= 
400:80=
=5