Chemistry help!?

A graduated cylinder contains three liquids A, B and C, which have different densities and do not mix: mercury (D = 13.6g/mL), vegetable oil (D = 0.92 g/mL), and water ( D = 1.00 g/mL). Identify the liquids A, B and C in the cylinder.
It looks like for C the cylinder is at the 18 mark, B is at 34, and C is at 50. Please show how to work it out. Thanks!

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