Question
Nora had 120 markers. 45 of them were black markers and the rest were green markers. After she had given away some black markers, the ratio of the number of black markers to the number of green markers became 5 : 6. How many black markers did she give away?
4 m

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Nora had 120 markers. 45 of them were black markers and the rest were green markers. After she had given away some black markers, the ratio of the number of black markers to the number of green markers became 5 : 6. How many black markers did she give away?