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There were 336 red and blue pens in a box. ¼ of them were red. After some red pens were removed, the number of remaining red pens was 1/7 of the total remaining pens. What fraction of the total pens was removed?

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1/4 * 336 = 84

84-x = 1/7 (336-x)
x = 42

42/(336-42) = ____

42/294 simplified to 1/7

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