What is the pressure at the bottom of the water layer?

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To calculate the pressure at the bottom of a water layer beneath a floating oil layer, the pressure can be determined using the equation p = p0 + (density)(gravity)(depth). The oil layer is 0.50 meters thick, and the water layer is 1.20 meters thick. The density of the oil is not provided, but a common assumption is 850 kg/m3 for oil and 1000 kg/m3 for water. The pressure at the bottom of the water layer is the sum of the pressures from both layers, which can also be expressed as a function of the oil's density. Clarification on the oil's density is needed for an exact numerical solution.
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Homework Statement



A 0.50 meter thick layer of oil floats on a 1.20 meter thick layer of water. What is the pressure at the bottom of the water layer?

Homework Equations



p=p0 + (density)(gravity)(depth)

The Attempt at a Solution



I understand you treat the oil and water separately, as if they were both in separate tanks. Then simply add the results.

The density of the oil is not given so I am not sure how to solve
 
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You will apparently need the density of oil. You could assume a rough value of 850 kg/m3 and 1000 for water for the purposes of the problem until you get clarification, or else solve it generally and give your answer as a function of ρ.
 
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