Answer:
0.33 liters of water Bao use per liter of flour.
3 liters of flour Bao use per liter of water
Step-by-step explanation:
Given the graph which pass through the coordinates (0,0) and (3,1)
∴ Equation of line passing through these points can be written as

⇒ 
⇒
⇒ 
Now, we have to find liters of water Bao use per liter of flour i.e if x=1 then we find the value of y which is 3y=x=1 ⇒ 
Now, we have to find liters of flour Bao use per liter of water i.e if y=1 the we have to find the value of x which is x=3 litre