. In a mixture, R is 2 parts and S is 1 part. In order to make S to 25% of the mixture, how much of R is to be added?

• Ratio is 1 : 2
  
  So S = 1/3 and R = 2/3
  
  So if you add 1 part of R
  
  Ratio = 1 :3
  
  So S = 1/4 and R = 3/4
  
  So answer add 1 gallon of R ANSWER IS D
• 12 years agoHelpfull: Yes(10) No(1)
• In a mixture, R is 2 parts ( say 2x)and S (x) is 1 part.
  
  so S is 1/3 or 33.33 %.
  To make S as 25 % of mixture, S will remain as 1 part(x) and R should become 3(3x) part.
  
  so one part R i.e. amt x is to be added.
• 13 years agoHelpfull: Yes(7) No(2)
• ans is 1
  coz
  ratio is 1:2
  so s=1/3 r=2/3
  in mixture we ll add only r part, let it be x so total mixture ll be 3+x
  now part of s remains same eg 1
  so (1/(3+x))*100=25
  wll give x=1 eg ans
  
• 11 years agoHelpfull: Yes(3) No(0)
• r : s
  2 : 1
  75% : 25%
  3:1
  so 3-2=1.so answer will be one part of r is required.
• 8 years agoHelpfull: Yes(2) No(0)