If 500 gm of salt solution has 30% salt in it, how much salt must be added to make the concentration of salt 50% in the solution?  Choose the most appropriate option:  A) 200 gm  B) 280 gm  C) 202 gm  D) 700 gm  E) 206 gm
Explanation:   Amount of water in solution = 100 % - 30 % = 70 % of total   Amount of water = 70 % x 500 = 350 gm   Amount of water remains same for both the solutions. Therefore, let amount of new solution be x gm.   x = 350 x (100/ 50)   x = 700   Salt added = (700 – 500) = 200 gm   200 gmlternate solution:   Quantity of sugar to be added :   = [Solution (Required % value – Present % value)] / (100 – Required % value)   = [500 (50 – 30)] / 100 – 50   = (500 x 20) / 50   = 200 gm   200 gmNSWER: 200 gm
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If 500 gm of salt solution has 30% salt in it, how much salt must be added to make the concentration of salt 50% in the solution?