How Does Adding a Lighter Liquid Affect Water Displacement in a Modified U-Tube?

[aub]

Figure 14-32 shows a modified U-tube: the right arm is shorter than the left arm. The open end of the right arm is height d = 10.0 cm above the laboratory bench. The radius throughout the tube is 1.30 cm. Water is gradually poured into the open end of the left arm until the water begins to flow out the open end of the right arm. Then a liquid of density 0.830 g/cm3 is gradually added to the left arm until its height in that arm is 9.20 cm (it does not mix with the water). How much water (in cm3) flows out of the right arm?

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I have no idea how to begin!

 

[WhoWee]

How much water will be displaced - as you add a specific volume?