Question

30:90 three equivalent ratios

Answer 1

Divide both terms of the ratio by a same number, as 10, 30 and 15, for example:

$\frac{30}{90}=\frac{3}{9}=\frac{1}{3}=\frac{2}{6}...$

Answer 2

3:9
1:3
90:270
these are equivalent to 30:90