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.
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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.
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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:
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