The average age of 25 girls in a class decreases by 6 months when a new girl takes the place of 20 year old girl. Find out the age of the new girl.

The average age of 25 girls in a class decreases by 6 months when a ne

1.	The average age of 25 girls in a class decreases by 6 months when a new girl takes the place of 20 year old girl. Find out the age of the new girl.
A.	7.5 yr
B.	8.5 yr
C.	9 yr
D.	6 yr
Answer» B. 8.5 yr

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The average age of 25 girls in a class decreases by 6 months when a new girl takes the place of 20 year old girl. Find out the age of the new girl.

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