15 - (6 + 6 × 6) ÷ (9 + 5)
28
18
12
24
As we know, order of operation of BODMAS is as follows
Brackets
Of
Division
Multiplication
Addition
Subtraction
15 - (6 + 6 × 6)÷ (9 + 5)
= 15 – (6 + 36) ÷ (9 + 5)
=15 - 42 ÷ 14
=15 - 3
=12