Question
The mass of 10 guide books and 3 colouring books is 2.57 kg. The mass of 4 guide books and 7 colouring books is 2.13 kg. Find the mass of each colouring book.
4 m

Click button first when a symbol is required. X

The mass of 10 guide books and 3 colouring books is 2.57 kg. The mass of 4 guide books and 7 colouring books is 2.13 kg. Find the mass of each colouring book.