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1. Math problem 10 urgent! ! ! ! !
1. The number of books in one class+the number of books in another class = the total number of books.

2. Hot water set made by master+hot water set made by apprentice = 1620 hot water set.

3. Reuse time+Reuse time =6 hours.

4. Coat ×6= trousers× 9 = 405 yuan (coat: trousers = 9: 6 = 3: 2)

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