Question
The mass of 10 colouring books and 7 story books is 2.64 kg. The mass of 4 colouring books and 7 story books is 1.56 kg. Find the mass of each story book.
4 m

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The mass of 10 colouring books and 7 story books is 2.64 kg. The mass of 4 colouring books and 7 story books is 1.56 kg. Find the mass of each story book.