Dear Kokab, Salam
Please use the BODMAS principle.
INHERITANCE: Have you heard of BODMAS?
When you have a question. With +, -, x, brackets .... then BODMAS tells us to work out what is in the Brackets first, then Division, then Multiplication before finally doing the Addition and Subtraction. If you do it other ways you can end up with a different answer.
courtesy: Jawaid Ahmed