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Xiao Ming has 5 yuan and 1 yuan 10 paper towels, and 38 yuan's. How many tissues are there? Fourth grade math problems
If all 10 banknotes belong to 1 yuan, then the amount is 10 yuan.

Moreover, from the actual amount of 38 yuan, without 28 yuan, 28 yuan has changed from 5 yuan to 1 yuan.

Then 5 yuan's Zhang Wei (38- 10)/(5- 1)=7.

So the number of 1 yuan is 10-7=3.

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