8 জন শিক্ষার্থীর বয়সের গড় 8 বছর।এদের সাথে একজন শিক্ষকের বয়স যোগ করায় তাদের বয়সের গড় 7 বছর.....

8 জন শিক্ষার্থীর বয়সের গড় 8 বছর।এদের সাথে একজন শিক্ষকের বয়স যোগ করায় তাদের বয়সের গড় 7 বছর বৃদ্ধি পায়।তবে শিক্ষকের বয়স কত?
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