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D e a r S t u d e n t, S o l u t i o n) 16) G i v e n : m e a n o f f i r s t n n a t u r a l n u m b e r = \frac{5 n}{9} A s, w e k n o w t h a t m e a n o f f i r s t n n a t u r a l n u m b e r s = \frac{n + 1}{2} \Rightarrow \frac{5 n}{9} = \frac{n + 1}{2} \Rightarrow 10 n = 9 n + 9 \Rightarrow 10 n - 9 n = 9 \Rightarrow n = 9 K i n d l y p o s t r e s t q u e r i e s i n a n o t h e r t h r e a d . R e g a r d s!

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