A mother is twice as old as her daughter 5 years from now she will be thrice as old as her daughter how old is the mother five years from now Representation:
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solution:

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There are 15 rings on the laddey

The first one, i believe, would be correct. all the others have one thing in common, and that's that they have repeating numbers. in the second one, x and y have repeating 6's and 3's, and in the third, x and y have repeating 6's as well. in the last one, there are repeating 3's. the first one has no repeating numbers.