Change Cell Formula from master sheet

What i want is this:

I have a workbook with 12 sheets... 1 for each month

In this i have cells for tracking sales....

cell Q6 has a formula of =SUM(H5:H98)+INT(SUM(I5:I98)/5)

What i want is to have a sheet called master that if i want to change the formula to somthing like lets say =SUM(H5:H9) it will automatically change all the sheets to that in cell Q6

Is this possible?

I thought maybe doing this would work but nope

=master!q6