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 ltr mixture so that the percentage of unleaded petrol becomes 5%?
Pick one
A) 1000 ml B) 900 ml C) 1900 ml D) 1800 ml E) None of these
In 1 lit mixture quantity of unleaded petrol = 100 ml   Let x ml leaded petrol be added, then   5% of (1000 + x) = 100 ml   or, 5 (1000 + x) = 100 × 100   ⇒ x = 5000⁄5 = 1000 ml   1000 mlnswer 1000 ml
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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 ltr mixture so that the percentage of unleaded petrol becomes 5%?