Question 18165
15% of 8 quants  = pinaple juice 
(100% - 15%)85% = others

so we have (15/100)*8 quants of pinaple juice available  
and we have (85/100)*8 quants of others available  

to make the mixture as 50% juice and 50% others 
the quantity of juice should be equal to quantity of others

so quantity of juice and others in new mixture is (85/100)*8 each

so we need to add x quants of juice to the 
present quantity to make it (85/100)*8

so (15/100)*8 + x = (85/100)*8
=>              x = (85/100)*8 - (15/100)*8 
=>              x = (70/100)*8 
=>              x = (7/10)*8 
=>              x = (7*8)/10
=>              x = 5.6 quants 

5.6 quants of juice is to be added to the old mixture to make it 50-50


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