1.

Two solutions of 90% and 97% purity are mixed, resulting in 21 L of mixture of 94% purity. The quantity of the second solution in the resulting mixture, (in L) is1). 152). 123). 94). 6

Answer»

advice - use alligation 

let see-AB

9097

 

 

94

 

 

(97-94):(94-90)

3:4=7 = 21ltrs (GIVEN)

||||

||1 = 3ltrs

|4*3ltrs = 12ltrs  (SECOND SOLUTION) = answer

3*3 = 9ltrs (first solution)



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