Question

Four girls have an average weight of 60 kg. If Adhi is also included in this group, the average weight
becomes 63 kg. What is Adhi's weight? oombunga​

Answer 1

Answer:

Let there be n students in the class.

60n+64(8)=62(n+8)

62n−60n=64(8)−62(8)

2n=16

n=8

Therefore, initially there were 8 students in the class.

Answer 2

Answer:

Given,

average weight of 4 girls = 60kg

after including Adhi, average weight of 5 girls = 63kg

to find: weight of Adhi

Explanation:

Average = total weight / total number of girls

initially,

average wt. of four girls = total weight of 4 girls/ 4

60 = total wt. of four girls / 4

240kg = total wt. of four girls

after including Adhi,

average wt. of five girls = total weight of 5 girls/ 5

63 = total wt. of five girls / 5

315 kg = total wt. of five girls

weight of Adhi = total wt. of five girls - total wt. of four girls

weight of Adhi = 315-240

weight of Adhi = 75kg.