Question

Select all ratios equivalent to 3:1.

15:3
21:7
9:4

Answer 1

To determine which ratios are equivalent to \(3:1\), we can simplify each ratio and see if it reduces to the same form as \(3:1\).

1. **For 15:3**:
\[
\frac{15}{3} = 5:1
\]
(Not equivalent)

2. **For 21:7**:
\[
\frac{21}{7} = 3:1
\]
(Equivalent)

3. **For 9:4**:
\[
\frac{9}{4} = 2.25:1
\]
(Not equivalent)

Thus, the only ratio that is equivalent to \(3:1\) is **21:7**.