In a classs there are 20 boys whose average age is decreased by 2 monthss when one boy aged 18 years is replaced by 2 new boy. the age of the new boy is ?

16 yrs 2 months
b- 15 yrs 2 months
c- 14 yrs 8 months
d- 13 yrs 4 montht... plz solve it

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