Question
The mass of 10 textbooks and 7 colouring books is 2.52 kg. The mass of 4 textbooks and 9 colouring books is 2 kg. Find the mass of each colouring book.
4 m

Click button first when a symbol is required. X

The mass of 10 textbooks and 7 colouring books is 2.52 kg. The mass of 4 textbooks and 9 colouring books is 2 kg. Find the mass of each colouring book.