Question

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

Answer 1

Answer:

Step-by-step explanation:

Let 4the sister age be X

Average=16+18+20+X/4

58+X/4=20

X=80-58

So,X=22

Therefore 4the sister age is 22yes

Hope you understand

Answer 2

Answer:

Step-by-step explanation:

The average is 20

Let the Age of fourth sister be X.

Now,

(16+18+20+X )/4 =20

54+X/4=20

54+X =20*4

54+X = 80

X = 80-54

= 26 years