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The ratio of red to yellow beads left is 1:3.
Let's represent that by u:3u.
Add back the 2u yellow and 65 red that were used
and we get the diagram above. It is total of 485.

So 6u + 65 = 485 which means u = (485 - 65)/6 = 70.
Red beads at start = 70 + 65 = 135.
So 65/135 = 13/27 of the red beads were used.
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