Question
A book shop sold 1 file for $10. For every 4 files sold, an additional file would be given free. If Mrs Choo spent $120 on the files, how many files did she receive in total?
4 m

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A book shop sold 1 file for $10. For every 4 files sold, an additional file would be given free. If Mrs Choo spent $120 on the files, how many files did she receive in total?