100 doors level 48, you will see the mathematical notation on the wall, and the clue is writing “23 July 2012″ on the floor. you need to change number on the door, so the door can be opened.
maybe you already have the answer to that is 10 and 23, but how the logic to get the answer, i will explain to you, do not be fooled by the summation notation (because when added together the result is not as it is expected). this is about sum days between two date
example is on the top of the door
815 + 20 = 904 ( 815 means : August 15, 904 means: September 4, 20 means : the number of days between August 15 and September 4)
so, the answer for left notation
320 + ?? = 412 ( How many days between the dates of March 20 to April 12, the answer is 23 days)
right notation
529 + ?? = 608 (How many days between the dates of may 29 to June 8, the answer is 10 days)
so for square the answer is 23
and for triangle the answer is 10
