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You can find out the base by the following way.. Let us consider the example:

(25/3)=7

To find its base let as assume it has base r.. Now find the value of r by converting the nums in decimal:

(2r+3)/3=7 (As 25 in base r is equal to 2*(r^1) + 5*(r^0) in decimal)

2r+3=21

2r=21-3

2r=18

r=9

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