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The easiest way to approach this one is to combine 1/4 and 1/4 (or 1/3 and 1/3). We only need to know which cup is the bigger one. The cup which is 1/4 filled is the bigger one. So: We know that EQUAL ammount is poured into the two jars. If you add water into the first jar and it is 1/4 filled, and then once again the same ammount (1/4 of the jar) you will get the final result. Or: 1/4 + 1/4 = 1/2