4. Salt and water solutions contain 12% salt. When 2 liters evaporates from such 4 liters of solution, the percentage of salt in the remaining solution is:
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24%
Step-by-step explanation:
12% salt means
salt is present in 4 litre solution = 12*4/100 lit.= 0.48 lit.
now 0.48 lit. is present in 2 litre solution.
percentage of salt in remaining solution = 0.48*100/2 % = 24%
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