Question

Which ratio is different from the other three 2/5 610 8/20 12:30

Answer 1

When we make decimals of all the fractions, we would get the following:

$\frac{2}{5} = 0.4$
$\frac{6}{10} = 0.6$
$\frac{8}{20} = 0.4$
$\frac{12}{30} = 0.4$

As you can see, all the numbers equal 0.4, with the exception of 6/10. Hence, the number with the other ratio is 6/10.