Question

Cup A is 40% filled with oil. Cup B, which is identical to cup A, is completely filled with a mixed solution containing 70% oil and 30% water. 60% of the content in Cup B is poured into A. After mixing, 60%of the mixed solution in Cup A is poured into B. Find the percentage of oil in cup A now.

Please show me the explanation and working. :)

Answer 1

you know oil floats on water so 30% of water will be at the bottom and 70% of the oil will be floating. when 60% of cup B is poured in cup a only oil flows into cup A because it cannot mix with water.The total % of oil in cup A will be 100%