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Mathematical problems. During the Double Eleven Shopping Carnival, Xiaoli took a fancy to a walnut on Taobao. Each package of 20 yuan, more than 5 packages need to be mailed to 5 yuan.
When more than 5 packages are set, the price of X package is the same.
20x+5 = 20.5 times
0.5x=5
X= 10 packaging
When it is set to no more than 3 packs, the price is the same as when X packs.