Question

Select all ratios equivalent to 12:2.
30:5
18:3
21:1

Answer 1

To determine which ratios are equivalent to 12:2, we can simplify 12:2 and compare it with the given ratios.

First, simplify 12:2:

\[
\frac{12}{2} = 6
\]

So, 12:2 simplifies to 6:1.

Now, let's simplify the given ratios:

1. **30:5**:
\[
\frac{30}{5} = 6
\]
This simplifies to 6:1, so 30:5 is equivalent to 12:2.

2. **18:3**:
\[
\frac{18}{3} = 6
\]
This also simplifies to 6:1, so 18:3 is equivalent to 12:2.

3. **21:1**:
\[
\frac{21}{1} = 21
\]
This simplifies to 21:1, which is not equivalent to 6:1 (12:2).

So, the ratios equivalent to 12:2 are:
- 30:5
- 18:3