The ratio of white to green marbles in a bag is 5/12. How many green are there if there are 51 total marbles? Please explain how to do ratios and porprotions. (:

So for every 5 white marbles there are 12 green ones. The easiest way to do this is to increase the ratio. so:  5white/12green=17total        10w/24g=34 total         15w/36g= 51 total