Question

2 x [ 90 : 2 + ( 120:4-20)] x10

Answer 1

2 x [ 90 : 2 + ( 120:4-20)] x10 = 

= 2 x [ 45 + ( 30-20)] x10

= 2 x ( 45 + 10) x10

= 2 x 55 x10

= 110 x 10

= 1100

Answer 2

2×[90÷2+(120÷4-20)]×10=
2×[45+(30-20)]×10=
2×(45+10)×10=
2×55×10=
110×10=
1100