1.

The average weight of a class is 36 kg. If a student with weight 15 kg joins the class, then new average weight becomes 33 kg. How many total number of students are there in the class?1). 52). 63). 84). 9

Answer»

LET the total number of student be X.

Then, the total weight of STUDENTS = 36x

If a student with weight 15 kg joins the class, then new average weight becomes 33 kg

⇒ 36x + 15 = 33(x + 1)

⇒ 36x - 33x = 33 - 15 = 18

3X = 18

⇒ x = 6

Hence, the total number of students = 6


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