Answers: 2
![\bf 4:15~~=~~15:20\qquad \qquad \cfrac{4}{15}=\cfrac{15}{20}\implies \cfrac{2\cdot 2}{3\cdot 5}=\cfrac{3\cdot ~~\begin{matrix} 5 \\[-0.7em]\cline{1-1}\\[-5pt]\end{matrix}~~}{2\cdot 2\cdot ~~\begin{matrix} 5 \\[-0.7em]\cline{1-1}\\[-5pt]\end{matrix}~~}\implies \cfrac{4}{15}\ne \cfrac{3}{4}~~\bigotimes](/tpl/images/0281/8295/4d2f7.png)
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Do the ratios 4: 15 and 15: 20 form a proportion?...
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