Question
The mass of 6 colouring books and 7 textbooks is 2.12 kg. The mass of 4 colouring books and 9 textbooks is 2.02 kg. Find the mass of each textbook.
4 m

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The mass of 6 colouring books and 7 textbooks is 2.12 kg. The mass of 4 colouring books and 9 textbooks is 2.02 kg. Find the mass of each textbook.