Question 1171556
I take along a bottle with some wine in it for an excursion in the spring.
 On reaching a tavern, I double the bottle’s content and drink 1 9/10 dou in the tavern. 
After passing 4 taverns, the bottle is empty.
 How much wine was there at the beginning? Show your solutions.
:
let x = the amt of wine originally
Assuming he drinks 1.9 d at each tavern
2x - 1.9 - 4(1.9) = 0
2x - 1.9 - 7.6 = 0
2x - 9.5 = 0
2x = 9.5
x = 9.5/2
x = 4.75 d originally