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Answer» Let total number of students be X. Then, the sum of total weight of class = 40x If a STUDENT with weight 60 kg joins the class, the new AVERAGE weight BECOMES 42 kg. ⇒ 40x + 60 = 42(x + 1) ⇒ 40x + 60 = 42X + 42 ⇒ 42x - 40x = 60 - 42 ⇒ 2x = 18 ⇒ x = 9 Hence, the total number of students in class = 10. |
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