Question

Choose all the ratios below that are equivalent to 3:9.
1:7
1:3
12:36
6:18
27:9

Answer 1

Equivalent ratios to 3:9 must equal 1:3 (since 3:9 = 1:3). Checking each:

- 1:7 → 1/7 ≠ 1/3 (no)
- 1:3 → 1/3 = 1/3 (yes)
- 12:36 → 12/36 = 1/3 (yes)
- 6:18 → 6/18 = 1/3 (yes)
- 27:9 → 27/9 = 3 = 3/1 ≠ 1/3 (no)

So the equivalent ratios are 1:3, 12:36, and 6:18.