Which ratio forms a proportion with 20/30? Use equivalent ratios to test each ratio.

B. 10/20

20/30 = 10/20

A is the answer.

AAAaannndd the bot gets it wrong yet again!

20/30 = 2/3 = 16/24

There's a bot? Also thanks Any bird and Oobleck.

To determine which ratio forms a proportion with 20/30, we need to test each given ratio to see if it is equivalent to 20/30.

The definition of equivalent ratios is that they have the same value when simplified. So, let's simplify each ratio and compare them to 20/30:

A. 16/24 simplifies to 2/3
B. 10/20 simplifies to 1/2
C. 17/51 does not simplify further
D. 15/60 simplifies to 1/4

Now, let's compare the simplified ratios to 20/30:

A. 2/3 is not equivalent to 20/30
B. 1/2 is equivalent to 20/30
C. 17/51 is not equivalent to 20/30
D. 1/4 is not equivalent to 20/30

From the above analysis, we can conclude that the ratio 10/20, which simplifies to 1/2, forms a proportion with 20/30. Therefore, the correct answer is B.