Answer: 0
Explanation:
When solving you need to use PEMDAS, this tells you the order in which to solve
Parenthesis first
Exponents
Multiplication/Division (whichever comes first working left to right)
Addition/Subtraction (whichever comes first working left to right)
49 - [23 + {27 - (9 of 3 ÷ 27)}] start with inner most parentheses first, of means multiply
49 - [23 + {27 - (27 ÷ 27)}] still inner most parentheses
49 - [23 + {27 - 1}] once you finish a parentheses you can drop it
49 - [23 + 26]
49-49
0