Subtracting Numbers

1) Observe the Given Calendar Properly and Answer the Following Question:

1. What Day of the Week Will Be It After Subtracting 1 Winal From 12/31/2009?
2. What Day of the Week Will Be After Subtracting 9 K’in from 12/30/2009?
3. What Day of the Week Will Be After Subtracting 2 K’in from 12/13/2009?

1. We know 1 Winal = 20 day
   Now, if we subtract 20 days from 31, we get 11
   31 – 20 = 11
   So, the date is 12/11/2009
   The required day is Friday.
2. We know 9 K’in = 9 days
   Now, if we subtract 9 days from 30, we get 21
   30 – 9 = 21
   So, the date is 12/21/2009
3. We know that 2 K’in = 2 days
   Now, if we subtract 2 days from 13, we get 11
   13 – 2 = 11
   So, the date is 12/11/2009
   The required day is Friday.