Double it when you meet a store, and have a drink when you see flowers.

I met the shop flower three times and drank all the wine in the pot.

How much wine is there in the hip flask?

Solution: There was a barrel of wine in the pot.

A * * * met three times.

1 When you meet shops and flowers, the remaining amount of alcohol is 2x- 1.

When I met the shopkeeper and Hua for the second time, the remaining amount of wine was 2*(2x- 1)- 1.

When I met the shopkeeper and Hua for the third time, the remaining amount of alcohol was 2 * [2 * (2x-1)-1]-1.

Establish an equation according to the meaning of the question.

2 *[2 *(2x- 1)- 1]- 1 = 0

X=7/8 (barrel) is obtained by solving.