alleryHow much pure salt must be added to 40 kg of a 10% salt solution to make it 20%?
A8 kg
B5 kg
C6 kg
D4 kg
Answer & Solution
Correct answer: B. 5 kg
Salt is 4 kg; (4 + x)/(40 + x) = 0.2 gives 0.8x = 4, so x = 5 kg.
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