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Find the biggest answer possible when a two-digit number is divided by the sum of its digits.

A normal Duck has two legs. A lame dauck has one leg. A sitting duck has no legs. A group of 69 ducks has a total of 79 legs. Kieran looked at the group and worked out that if she doubled the number of lame ducks and added on the number of sitting ducks, she came to a number which equalled the...