Question
A book shop was having promotion for files. For every 3 files bought, 1 file would be given free. Each file costs $3. Lucy paid $18 for some files. How many files did she get altogether?
4 m

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A book shop was having promotion for files. For every 3 files bought, 1 file would be given free. Each file costs $3. Lucy paid $18 for some files. How many files did she get altogether?