After 25 kg of water had been evaporated from a solution of salt and water, which had 20% salt, the remaining solution had 30% salt. Find the weight of the original solution.
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Let x be the original wt of solution.
wt of salt = 20x/100
After evaporation, the new wt of solution = x-25
wt of salt = 30(x-25)/100
Now equate the wt of salt
20x/100 = 30(x-25)/100
20x = 30x - 750
10x = 750 or x = 75 Kg ,
The wt of original solution is 75 Kg
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