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19 Feb 2004, 10:00
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A solution of salt and water contains 15% salt by weight. Of it 30 kg water evaporates and the solution now contains 20% of salt. Find the original quantity of salt?
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19 Feb 2004, 10:30
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S/(S+W) = 0.15
0.85S = 0.15W or 17S = 3W
S/(S+W1) = 0.2
W1 = W-30
0.8S = 0.2W-6 or 4S = W-30
12S = 3W-90
17S = 3W
so 5S = 90 or S = 18 Kg
0.85S = 0.15W or 17S = 3W
S/(S+W1) = 0.2
W1 = W-30
0.8S = 0.2W-6 or 4S = W-30
12S = 3W-90
17S = 3W
so 5S = 90 or S = 18 Kg
