Another way of thinking about the riddle


#1

one another way to solve: let’s imagine that at first day spider does 1 item of his work. as we know from the riddle every next day spider doubles his work. What it’s else if it’s not power of 2 sequence ? on day 15th spider will do 16384 items of his work. Divide 16384 to 4 ( 25% percents ) - we will get what we have on 13th iteration. Voila - that is the answer :wink:

day 1: 1
day 2: 2
day 3: 4
day 4: 16

day 13: 4096
day 14: 8192
day 15: 16384