I need help with simple macro, I have two slides on which I have labels with the number 20th I need a macro to me every second subtracted from the number one 20 and two on the slides will also be deducted. Subtraction results in the number 0
So every second of the two slides reduced by one digit, then after 20 seconds is to 0. The revised figures must always show the field value in the label.
Thank you in advance for your help, I attach the sample.