Question
A bag had some black pens and green pens in the ratio of 3 : 2. Hilda removed 36 black pens and put another 20 green pens into the bag. There is now 50% as many black pens as green pens in the bag. How many black pens were in the bag at first?
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A bag had some black pens and green pens in the ratio of 3 : 2. Hilda removed 36 black pens and put another 20 green pens into the bag. There is now 50% as many black pens as green pens in the bag. How many black pens were in the bag at first?