Question

17. The average weight of
student is admitted to the
eight of a class of 39 students is 40 kg. When a new
utted to the class, the average decreases by 200 g. Find
the weight of the new student.​

Answer 1

Answer:

Weight of student who left is 47.6 kg

1) Number of students in the class = 39

Average of weight of class = 40 kg.

Sum, of weight of complete class = 39*40 = 1560 Kg

2) One student leaves,

Number of remaining students = 39-1 = 38

Decrease in Average weight = 200g

new average weight = 39.8 kg

Sum of weight of complete class = 39.8 *38 = 1512.4 kg

3) Weight of student who left = 1560-1512.4 = 47.6 kg