correct order of operations.
Another mistake is to assume that the puzzle must contain a complicated trick simply because it says the answer is not 25.
Sometimes, the wording is there just to make you second-guess yourself.
You might also be tempted to combine the two 15s first because they appear next to each other in the expression.
However, there is no operation telling you to add those numbers before dealing with multiplication and division.
The symbols matter just as much as the numbers.
The × and ÷ signs must be handled
