Question
In a shop, a box of files costs thrice as much as a colouring book. Mrs Sih spent 13 of her money to buy 6 boxes of files. She then spent 79 of her remaining money to buy some colouring books and had $19.20 left. How much does each colouring book cost?
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In a shop, a box of files costs thrice as much as a colouring book. Mrs Sih spent 13 of her money to buy 6 boxes of files. She then spent 79 of her remaining money to buy some colouring books and had $19.20 left. How much does each colouring book cost?