Chemistry density problem help?

I’m just asking so i can study for my tests so please show me step by step on how you got the answer. thank you so much.

Use the density value to solve the following problems:

A) A graduated cylinder contains 18.0 mL of water. What is the new water level after 35.6 g of silver metal with a density of 10.5 g/ml is submerged in the water?

B) a thermometer containing 8.3 g of mercury has broken. If mercury has a density of 13.6 g/ml, what volume spilled?

C) A fish tank holds 35 gal of water. Using the density of 1.0 g/mL for water, determine the number of pounds of water in the fish tank.
I dont get number 2. number 2 you’re suppose to take 13.6 / 8.3 ?

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