15.
[tex] \frac{31}{20} ; \frac{33}{10} ; \frac{37}{20} \frac{39}{20} [/tex]
[tex] \frac{22}{13} ; \frac{22}{15} ; \frac{22}{17} ; \frac{22}{19} [/tex]
[tex] \frac{23}{34} ; \frac{25}{54} ; \frac{27}{74} ; \frac{29}{94} [/tex]
[tex] \frac{1}{71} ; \frac{3}{73} ; \frac{9}{79} [/tex]
----------------------
16.
[tex] \frac{231}{342} = \frac{77}{114} [/tex]
[tex] \frac{234}{342} = \frac{78}{114} = \frac{39}{57} = \frac{13}{19} [/tex]
[tex] \frac{237}{342} = \frac{79}{114} [/tex]
[tex] \frac{231}{345} = \frac{77}{115} [/tex]
[tex] \frac{234}{345} = \frac{78}{115} [/tex]
[tex] \frac{237}{345} = \frac{79}{115} [/tex]
[tex] \frac{231}{348} = \frac{77}{116} [/tex]
[tex] \frac{234}{348} = \frac{78}{116} = \frac{39}{58} [/tex]
[tex] \frac{237}{348} = \frac{79}{116} [/tex]
