How many kg of pure salt must be added to 30kg of 2% solution of salt and water to increase it to a 10% solution ?
Amount of salt in 30 g solution = `(2/100 xx 30)`kg = 0.6 kg
Let `x` kg of pure salt be added .
Then , `(0.6 + x)/(30 + x) = 10/100 hArr 60 + 100x = 300 + 10x hArr 90x = 240 hArr x = 8/3 = 2 2/3`
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