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.
