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

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let the mixture be 30litres hence r is 20 and s is 10
let x is the quantity of r to be added here the quantity of s is constant
(30+x)*(25/100)=10
x=10 hence overall r is 30 and s is 10 hence(40*25%=10)
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