A petrol pump owner mixed leaded and unleaded petrol in such a way that the maximum contains 10% unleaded petrol. What quantity of leaded petrol should be added to 1 litre mixture so that the percentage of unleaded petrol become 5% .

Options

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

Answer

A

Explanation

(a) In 1 litre quantity of unlead petrol=10 ml
Let x ml leaded petrol be added , then
5% of (1000+x)=100ml
`or , 5(1000+x)=100 xx 100`
`implies x=(5000)/(5)=1000 ml`