What was the original length, if the original width was 9 cm?

Let the original lenght = x cm.

and the given width = 9 cm.

1st wish:

lenght =x/2 cm; width =9/3=3 cm;

2nd wish:

lenght =x/4 cm; width =1 cm;

3rd wish:

lenght =x/8 cm; width =1/3 cm;

After three wishes:

The given Surface area A (say) = 4 cm2;

Surface area A = length * width;

4 cm2 =(x/8 )*(1/3) cm2;

x = 4 *24= 96 cm;

The original length x= 96 cm;