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.

7.5 yr
8.5 yr
9 yr
6 yr

Correct Answer: 7.5 yr

Explanation:

Total decrease in the age = 25 x 1/2 =12.5 yr
∴ Age of new girl = 20 - 12.5
= 7.5 yr

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