(6 × 5 + 30) ÷ (10 + 50)-100 ÷ 2
-49
As we know, order of operation of BODMAS is as follows
Brackets
Of
Division
Multiplication
Addition
Subtraction
(6 × 5 + 30) ÷ (10 + 50)-100 ÷ 2
= (30 +30) ÷ 60 - 100 ÷ 2
= (30 +30) ÷ 60 - 50
= 1 – 50
= -49