Question

A bag contains 5 red marbles, 3 blue marbles, 7 yellow marbles, and 2 green marbles. Which ratio can be used to compare the red marbles to the blue marbles?

Answer 1

ok so we have
blue=3
and red=5

Answer 2

and in total we have how many marbles?

Answer 3

ok just wanted to make sure you were following you won't be needing that :p
but you need the probability therefore you will need to know that it is 5:3 or 5/3

Answer 4

because the red marbles to the blue marbles=5 red to 3 blue=5:3=5/3