At this time, the big bag is four times that of the small bag, so the big bag is three times more than the small bag: 4- 1=3.
So the weight of eye bags at this time: 60÷3=20 (kg).
Original pouch weight: 20+4=24 (kg)
Original weight of big bag: 20×4=80 (kg)
Analysis: This is a typical differential problem.
Summary of solving problems: divide the difference between two quantities by the multiple of the difference, and you can get the multiple of 1