How do you identify equivalent ratios

You can find equivalent ratios by multiplying or dividing both sides by the same number

The correct answers are:

A
B
G

It's because the ratio is 5:2. 250:100 is the same thing when you multiply 5:2 by 50, hence A is correct.

10 to 4 is also correct because 10 to 4 is the same as 10:4, and the original ratio is 5:2. You just have to multiply the ratio by 2 to get 10:4, and they're still equivalent. 

G is also correct because 50 to 20 is the same as 50:20, and when you divide that by 10, you get 5:2, which is the same ratio. 

Ais the correct answer