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 litre mixture so that the percentage of unleaded petrol becomes 5%? Select one:
a. 900ml
b. 1800ml
c. 100ml
d. None of these
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100ml added to 1 litre of petrol
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