A jar holds 40 litres of pure juice. 10 litres are taken out and replaced with water, and the process is repeated once more. What is the final ratio of juice to water?
Correct answer D. 9:7
Explanation
Juice left = 40 x (3/4)^2 = 22.5 litres, so water = 17.5 litres. Juice : water = 22.5 : 17.5 = 9 : 7.
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