I believe the ratio in simplest form is 1.3 to 0.7.
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we can start off by convering those decimals to a fraction, we have one decimal on each, so we'll use one zero on the denominator, therefore.
[tex] \bf 5.\underline{2}\implies \cfrac{52}{1\underline{0}}~\hspace{15em} 2.\underline{8}\implies \cfrac{28}{1\underline{0}} \\\\[-0.35em] \rule{34em}{0.25pt}\\\\ \cfrac{5.2}{2.8}\implies \cfrac{~~\frac{52}{10}~~}{\frac{28}{10}}\implies \cfrac{52}{10}\cdot \cfrac{10}{28}\implies \cfrac{52}{28}\implies \cfrac{13}{7} [/tex]
