A cask contained a solution with 40% spirit. Part of it was taken out and replaced with a solution containing 25% spirit, and the cask now has 30% spirit. What fraction of the original solution was replaced?
Correct answer D. 2/3
Explanation
Original : replacement = (30 - 25) : (40 - 30) = 5 : 10 = 1 : 2. So 2/3 of the original solution was replaced.
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