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Answer:
11.76% by weight in salt
Explanation:
concentration = mass of solute / mass of solute + mass of solvent
mass of solute = 20 grams
mass of solvent = 150 grams
mass of solute + mass of solvent = 20g + 150g = 170g
concentration (weight %) = (20g / 170g)100% = 11.76% by weight in salt.