How much pure alcohol should be added to 400ml of a 15% solution to make the strength of solution 35%?
Choose the correct choice:
A) 100 ml  B) 60 ml  C) 120 ml  D) 130 ml  E) 175 ml
we can also go by answer choices   Tke 100 ml for eg   400 (old)+100 (new concentr)ml     500*35/100= 
<gadget id="calculator">  500*35/100</gadget>
<output>175</output>
175 ml (75ml is de old concentration +100 ml (newly added)   Answer 175 ml
<result>E</result>
How much pure alcohol should be added to 400ml of a 15% solution to make the strength of solution 35%?