A container contains mixture of water and alcohol in the ratio 9 : 4 respectively. A person sold some mixture at Rs. 15 per litre and earned Rs. 390 and then added 4 litres of alcohol in the mixture and the ratio of water and alcohol became 2 : 1 respectively. Find the amount of water present in the container initially.

A container contains mixture of water and alcohol in the ratio 9 : 4 r

1.	A container contains mixture of water and alcohol in the ratio 9 : 4 respectively. A person sold some mixture at Rs. 15 per litre and earned Rs. 390 and then added 4 litres of alcohol in the mixture and the ratio of water and alcohol became 2 : 1 respectively. Find the amount of water present in the container initially.
A.	90 litres
B.	180 litres
C.	45 litres
D.	120 litres
E.	100 litres
Answer» B. 180 litres

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