Depending on where in the world you learned math, as Mashable reported, determines how you can solve the problem.

There is the PEMDAS method: the order of operations is Parentheses, Exponents, Multiplication, Division, Addition, Subtraction, typically from left to right.

There is also the BODMAS method: Brackets, Orders, Division, Multiplication, Addition, Subtraction.

So, the answer is 1.

The answer also is 16.