Question

the average of 4 sisyers is 20 .If the ahe of 3 disyers are 16 , 28 , 20 the age of the fourth sisyer is?​

Answer 1

Answer:

16

Step-by-step explanation:

Average Age = 20 (Given)

Average = $\frac{20+28+16+x}{4}$

x = 16

Answer 2

Answer:

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Step-by-step explanation:

average of 4 sisters = 20

Age of 3 sisters = 16,28,20

Let age of 4th sister be x

Age of 4th sister = 16+28+20+x/4=20

=> 64+x/4=20

By cross multiply,

=> 64+x=20*4

=> 64+x=80

=> x = 80-64

=> x = 16

therefore, Age of 4th sister is 16 years