How does winter vacation homework's sixth grade math problem the Monkey King break through the maze?

The Monkey King manages the flat peach garden. He planted a bunch of flat peaches and planned to eat them in four days.

I ate more than 1/4 flat peaches on the first day.

I ate more than 1/3 flat peaches the next day.

On the third day, I ate 1/2 more flat peaches.

On the fourth day, there was only one left. How many flat peaches did the Monkey King pick?

Adopt backward deduction method

There is one left on the fourth day and (1+ 1)*2=4 on the third day.

Then the next day, (4+2)/( 1- 1/3)=9.

Then the total number of picked flat peaches is (9+3)/(1-1/4) =16.

A: the Monkey King picked 16 flat peaches.