Question 321481
bye method of allegation mixture=  n1/n2=A2-A/A-A1
    
     A1= 5%     A2= 30%

            20%
     
    30-20       20-5
  n1 =10     n2 =15
         

ratio =10:15=2:3

     now 2:3::10:x

      2/3=10/x
then
      x=15