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"There is an oil tank that has a rectangular base of dimensions 2.4 m by 1.5 m. The tank is filled with oil of density 850 kg / m3 to a depth of 1.5 m. What is the mass of the oil?"

To solve this question, we have to first consider the formula of density, defined as the mass per unit volume of a substance:

ρ = m/V  U+21D2.svg  m=ρV
Where: ρ=density, m=mass, V=volume

We are already given the density of 850 kg/m^3, but how do we figure out volume? It’s pretty simple if we picture the oil tank as simply a cuboid. Since we know that a liquid like oil tends to take the dimensions of whatever container its in, the volume of oil will be equal to the volume of the cuboid it shapes itself as:
V = l.b.h = 2.4 . 1.5 . 1.5 = 5.4 m 
Therefore, the mass is:
m = 850 . 5.4 = 4590 kg

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