Original Question: 100 - [(25/5) x 10] = ? Note: Always answer what's inside FIRST. In this case, the main ts the brackets, but there's also parenthesis in it too. So solve that. →100 - [(5) x 10] = ? Now, solve what's inside the brackets. →100 - [50] = ? Well, you can get rid of the brackets. →100 - 50 = ? Subtract! →100 - 50 = 50 Solution: 50