(12 :16)-5

To evaluate the expression (12 : 16) - 5, we need to follow the order of operations, which is parentheses, exponents, multiplication and division (from left to right), and addition and subtraction (from left to right).

In this case, there are no exponents, multiplication, or division operations. We only have parentheses and subtraction.

First, let's simplify the expression inside the parentheses:

12 : 16 = 12 / 16 = 0.75

Now, we can substitute 0.75 back into the expression:

0.75 - 5

Finally, we can subtract 5 from 0.75:

0.75 - 5 = -4.25

So, the value of the expression (12 : 16) - 5 is -4.25.