Question

Sh...?
The average age of 4 sisters is 20. If the ages of
3 sisters are 16 yr, 18 yr and 20 yr, the age of
the fourth sister is.​​

Answer 1

The average age of 4 sisters is 20. If the ages of3 sisters are 16 yr, 18 yr and 20 yr, the age ofthe fourth sister is.

Answer 2

Answer:

let the age of forth sister is x

avg. age = total of all sisters age/ no. of sisters

20=16+18+20+x/4

20×4=54+x

80=54+x

x=80-54

x=24

so, the age of fourth sister is 24