15 litres of mixture contains 20% alcohol and the rest water. If 5litres of water be mixed with it, the percentage of alcohol in the new mixture would be?
Answers:
A) 16.67%	B) 23%	C) 15%	D) 19.75%	E) 21.23%
Alcohol in the 15litres of mix. = 20% of 15litres = (20*15/100)= 
<gadget id="calculator">(20*15/100)</gadget>
<output>3</output>
3litres   water in it= 15-3= 
<gadget id="calculator">15-3</gadget>
<output>12</output>
12litres   new quantity of mix.= 15+5= 
<gadget id="calculator">15+5</gadget>
<output>20</output>
20 litres   Quantity of alcohol in it= 3litres   Percentage of alcohol in new mix. = 3*100/20= 
<gadget id="calculator">3*100/20</gadget>
<output>15</output>
15%   Answer is 15%
<result>C</result>
15 litres of mixture contains 20% alcohol and the rest water. If 5litres of water be mixed with it, the percentage of alcohol in the new mixture would be?