Jane gets twice as many marbles as George, so the total number of marbles taken must be divisible by 3; that is, the difference between 140 and the number of chipped marbles must be divisible by 3. Of the six given numbers only 23 has this property. Therefore, there are 23 chipped marbles, leaving 19+25+34=78 for Jane and 18+21=39 for George.
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