Question
A bag had some black pens and brown pens in the ratio of 7 : 2. Esther removed 37 black pens and put another 13 brown pens into the bag. There is now 20% as many black pens as brown 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 brown pens in the ratio of 7 : 2. Esther removed 37 black pens and put another 13 brown pens into the bag. There is now 20% as many black pens as brown pens in the bag. How many black pens were in the bag at first?