1.

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 % ?

A. 1000 ml
B. 900 ml
C. 1900 ml
D. 1800 ml
Answer» B. 900 ml


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