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Question

Please help with this Rosyth Q. I derived the answer to be 96.  However, I did it using guess and check.  Would like to understand a better method. TIA. 

Answer

The total number is between 78 to 99.   ( 1 to 22 for 4C ) 

Then, the candidate for remainder 1 is 81, 86, 91 and 96. 

From these 4 numbers, only 96 fits the second condition… Isn’t it enough?? 

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Thank you so much

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