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

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