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What is the viscosity index of the mixture consisting of 400 litres of SAE 10W and 200 litres of SAE 20W? Oil density of both

What is the viscosity index of the mixture consisting of 400 litres of SAE 10W and 200 litres of SAE 20W? Oil density of both SAE 10W and SAE 20W is = 850 [kg/m3]. (Ans. VI = 48)

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