Question
A bag had some blue pens and red pens in the ratio of 5 : 1. Erika removed 30 blue pens and put another 21 red pens into the bag. There is now 50% as many blue pens as red pens in the bag. How many blue pens were in the bag at first?
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A bag had some blue pens and red pens in the ratio of 5 : 1. Erika removed 30 blue pens and put another 21 red pens into the bag. There is now 50% as many blue pens as red pens in the bag. How many blue pens were in the bag at first?