Question
There were some pens in Packet D and Packet E. After Zane transferred 35 of the pens from Packet D to Packet E, the ratio of the number of pens in Packet D to that in Packet E changed to 3 : 8. Find the ratio of the numbers of pens in Packet E to the number of pens in Packet D at first.
3 m

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There were some pens in Packet D and Packet E. After Zane transferred 35 of the pens from Packet D to Packet E, the ratio of the number of pens in Packet D to that in Packet E changed to 3 : 8. Find the ratio of the numbers of pens in Packet E to the number of pens in Packet D at first.