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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 | |