Correct Answer - Option 2 : 1 : 5

**Given: **

3 ratios are 1 : 3, 2 : 5 and 3 : 2

**Formula used: **

If a : b and c : d are two simple ratios, then their compounded ratio is ac : bd.

**Calculation: **

The compounded ratio of 1 : 3, 2 : 5 and 3 : 2 is

= 1/3 × 2/5 × 3/2 = 1/5 = 1 : 5