I have cells D5, G5, J5 and M5 are being calculated by `=imdiv(A5, B5) = D5`, for each of their respective cells. I want to create a formula to calculate the average of D5, G5, J5 and M5. I've tried using `=average(D5, G5, J5, M5)` and `=subtotal(101, D5, G5, J5, M5)` but both are returning a divide by zero error. Thanks for the help!