A mixture contains alcohol and water in the ratio 2:5. If 10liters of water is added to the mixture, the ratio becomes 2:7. Find the quality of alcohol in the given mixture.	Choose the correct choice.
A) 5	B) 10	C) 15	D) 20	E) 25
Let the quantity of alcohol and water be 2x and 5x   2x/(5x+10) = 2/7   20x = 4(3x+5)   x=5   Quantity of alcohol = 2*5= 
<gadget id="calculator">2*5</gadget>
<output>10</output>
10liters.   Answer is 10
<result>B</result>
A mixture contains alcohol and water in the ratio 2:5. If 10liters of water is added to the mixture, the ratio becomes 2:7. Find the quality of alcohol in the given mixture.