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Question
A petrol pump owner mixed leaded and unleaded petrol in such a way that the mixture contains 10 % unleaded petrol. What quantity of leaded petrol should be added to 1 liter mixtures, so that the percentage of unleaded petrol becomes 5 %?
Options:
A .  900 ml
B .  1800 ml
C .  1000 ml
D .  1900 ml
Answer: Option C

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