You Don't! Ha!
There are many sites which one can sell vintage marbles. One can place an ad on eBay or Kijiji. On the Buy Marbles website, one can both purchase and sell vintage marbles.
He will have 13 blue marbles and 10 green marbles.
10 Green marbles, 13 Blue marbles.
Of course ill tell you they sell them at FAMILY DOLLAR in Chicago IL in Western street
He has 10 green marbles.
There could be 12 white marbles and 16 red marbles
at least 39 blue marbles
8:6
12 blue marbles
12 blue marbles
24 red marbles
If there are 20 red marbles and 40 blue marbles, the ratio of red to blue is 1 over 2. The number of white marbles does not matter.