Question
The mass of 10 guide books and 7 colouring books is 2.5 kg. The mass of 4 guide books and 7 colouring books is 1.42 kg. Find the mass of each colouring book.
4 m

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The mass of 10 guide books and 7 colouring books is 2.5 kg. The mass of 4 guide books and 7 colouring books is 1.42 kg. Find the mass of each colouring book.