The arithmetic mean of the ages of 30 pupils in a class is 15.3 years. One boy leaves the class and one girl is enrolled, and the new average age of 30 pupils in the class becomes 15.2 years. How much older is the boy than the girl?
a
30 years
b
6 years
c
9 years
d
3 years
e
1 year
Explanation
Correct Option
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