Question 164921
cut twice into three pieces  __  1/7, 2/7, 4/7


1st day  __  pay with 1/7


2nd day  __  pay with 2/7, get 1/7 change


3rd day  __  pay with 1/7


4th day  __  pay with 4/7, get 1/7 and 2/7 as change


continue pattern