Question
A bag had some red pens and yellow pens in the ratio of 5 : 1. Zoe removed 35 red pens and put another 20 yellow pens into the bag. There is now 50% as many red pens as yellow pens in the bag. How many red pens were in the bag at first?
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A bag had some red pens and yellow pens in the ratio of 5 : 1. Zoe removed 35 red pens and put another 20 yellow pens into the bag. There is now 50% as many red pens as yellow pens in the bag. How many red pens were in the bag at first?