Ratio - Please Help me resolve this

So the ratio od R to G is

7.5:5

15:10

3:2

This was meant to be a table with borders but I can't get the borders to print  

Jerry has a box contained red, blue, and green markers. The ratio of red markers to blue markers is 5:2. The ratio of blue to green markers is 3:5. What is the ratio of red markers to green markers?

Note, that for every 7 red and blue markers, 2  are blue and 5 are red

So, for every  6 blue markers, 15 are red

And for every 8 blue and green markers,  3 are blue and 5 are green

So, for every 6 blue markers, 10 are green.

So, the ratio of red markers to green is 15 : 10    or just 3 : 2