1.

A solution of 8% boric acid is to be diluted. By adding a 2% boric acid solution to it. The resulting mixture is to be more than 4% but less than 6% boric acid . If we have 640 litres of the 8% solution, how many litres of the 2% solution will have to be added ?

Answer»


ANSWER :`320 LT X lt 1280`


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