1.

1). 92). 103). 114). 12

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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