Question
A colouring book costs 4 times as much as a post-it-pad. If 1 such post-it-pad and 1 such colouring book cost $15, how much does one colouring book cost?
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A colouring book costs 4 times as much as a post-it-pad. If 1 such post-it-pad and 1 such colouring book cost $15, how much does one colouring book cost?