in a mixture R is 2 parts and S is 1 part. In order to make S to 25% of the mixture how r is needed ? give the steps plz…..

2 Answers on this Question

1. Its very simple..
   consider the fraction of s in the mixture = 1/3
   So if we add one more R the the fraction wil be = 1/4
   Automaticaly S becomes 25% of the mixture

   Reply

2. S/(S+R)=25%
   i.e
   S/(S+R)=1/4
   R=3*S
   Since S=1
   R=3.
   Thus one more part of R should be added.

   Reply