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Well stated =D
What I'd do is I'd think about how many times I've drawn a marble TOTAL. Then I'd think about how many times I've drawn a specific color. Then I'd guess that the color was that fraction of the whole bag.
For example, imagine I have 20 marbles total in a bag. I draw 4 and I get a red marble once. I can guess that red is 1/4th of the bag, meaning there are 5 red marbles.
ok so how would i do it with 120 marbles
You drew: y-3 r-7 g-5 let's think about trying to guess how many greens are in the bag. Of the marbles that I drew, what fraction were green?
Right. Which is the same as 1/3. So if you pulled 1/3 greens, just assume that 1/3 of the 120 marble bag is greens. How many is that?
Try the other 2 colors on your own and tell me what you get.
hmmm for y i get 24 but for red its 7/15 so now what @SmoothMath