The information you clicked, When Donna gives Cathy 2 coins, they each have the same number., will lead to a solution of the problem. That solution path will be shown after the preferred solution path is completed.

Starting the solution with Donna has twice as many coins as Cathy. is preferred for two reason. (1) It responds directly to what the problem asks for and (2) it is the first response encountered in scanning the problem statement.

Click on the sentence in the problem statement
that provides a response to the current request.

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A SureMath solution. Copyright 1998, Howard C. McAllister.