The final volume of the water is 107.55 mL.
Volume = mass / density
Volume of quartz = 20 / 2.65
Volume of quartz = 7.55 mL
The final volume of the water can be obtained as follow:
Final volume of water = (volume of water) + (volume of quartz)
Final volume of water = 100 + 7.55
Final volume of water = 107.55 mL
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