How much pure alcohol should be added to 400ml of a 15% solution to make the strength of solution 32%? Choose the correct choice from the following options.
A) 100 ml  B) 60 ml  C) 120 ml  D) 130 ml  E) 150 ml
400ml has 15% alcohol i.e 60ml . This means we have 340ml of water or the liquid with which alcohol is mixed   Let V be the volume of alcohol added to make the strength 32%   then V/340+V = 32/100. solving this we get V as 160ml   so we need to add   160 -60= 
<gadget id="calculator">  160 -60</gadget>
<output>100</output>
100 ml of alcohol   100 mlNSWER:100 ml
<result>A</result>
How much pure alcohol should be added to 400ml of a 15% solution to make the strength of solution 32%?