Question
In a shop, a box of pencils costs thrice as much as a colouring book. Mrs Lin spent 18 of her money to buy 7 boxes of pencils. She then spent 79 of her remaining money to buy some colouring books and had $107.80 left. How much does each colouring book cost?
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In a shop, a box of pencils costs thrice as much as a colouring book. Mrs Lin spent 18 of her money to buy 7 boxes of pencils. She then spent 79 of her remaining money to buy some colouring books and had $107.80 left. How much does each colouring book cost?