Answer / antony kurian

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

Answer / vandana gopal

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.

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