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  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.
    1. 7.5 yr
    2. 8.5 yr
    3. 9 yr
    4. 6 yr
Correct Option: A

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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