What is the value of 3*(6*8)?

P and Q represent numbers, and P * Q means $\dfrac{\left(P+Q\right)}{2}$.What is the value of 3 * (6 * 8)?

As per the order of operations, parentheses are executed first.
So 6 * 8 = $\dfrac{\left(6+8\right)}{2}$
        = $\dfrac{14}{2}$ = 7

Then 3 * 7 = $\dfrac{\left(3+7\right)}{2}$
          = $\dfrac{10}{2}$ = 5

Hence 3 * (6 * 8) = 5