Question
There were some pencils in Packet E and Packet F. After Charlie transferred 45 of the pencils from Packet E to Packet F, the ratio of the number of pencils in Packet E to that in Packet F changed to 2 : 9. Find the ratio of the numbers of pencils in Packet F to the number of pencils in Packet E at first.
3 m

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There were some pencils in Packet E and Packet F. After Charlie transferred 45 of the pencils from Packet E to Packet F, the ratio of the number of pencils in Packet E to that in Packet F changed to 2 : 9. Find the ratio of the numbers of pencils in Packet F to the number of pencils in Packet E at first.