Mathematics · Average
एक बॉक्स में 81 कॉपियों (notebooks) का औसत वजन 8.1 किग्रा है। बॉक्स में एक नई कॉपी रखने पर नया औसत वजन 8.2 किग्रा हो जाता है। नई कॉपी का वजन ज्ञात कीजिए (किग्रा में)।
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