BODMAS is the priority order: Brackets, Of, Divide/Multiply, Add/Subtract.
BEDMAS is: Brackets, Exponent, Divide/Multiply, Add/Subtract.
PEMDAS has Parentheses instead of Brackets.
364÷2=182 has to be calculated first. Then we are left with add/subtract: 20711-182-113=20711-295=20416.