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10 litre. of a mixture A of Castrol oil ...

10 litre. of a mixture A of Castrol oil and petrol containing `64%` petrol, is added to 5 litre of a mixture B of Castrol oil and petrol, containing `55%` petrol, to get a mixture M. Then, 30 litre of a mixture C containing `12%` castrol oil is added to M. What is the percentage content of oil in the final mixture?

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0.21
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