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EXPERTS HELP NEEDED

which of the following ratio is not equivalent to 50:90?

a.5:9

b.15:19

c.10:18

d.25:45

Please find below the solution to the asked query :

$\frac{5}{9}=\frac{5\times 10}{9\times 10}=\frac{50}{90}\phantom{\rule{0ex}{0ex}}\frac{15}{19},\mathrm{it}\mathrm{is}\mathrm{not}\mathrm{equivalent}\mathrm{to}50:90\phantom{\rule{0ex}{0ex}}\frac{10}{18}=\frac{10\times 5}{18\times 5}=\frac{50}{90}\phantom{\rule{0ex}{0ex}}\frac{25}{45}=\frac{25\times 2}{45\times 2}=\frac{50}{90}$

$\frac{5}{9}=\frac{5\times 10}{9\times 10}=\frac{50}{90}\phantom{\rule{0ex}{0ex}}\frac{15}{19},\mathrm{it}\mathrm{is}\mathrm{not}\mathrm{equivalent}\mathrm{to}50:90\phantom{\rule{0ex}{0ex}}\frac{10}{18}=\frac{10\times 5}{18\times 5}=\frac{50}{90}\phantom{\rule{0ex}{0ex}}\frac{25}{45}=\frac{25\times 2}{45\times 2}=\frac{50}{90}$

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