Question
A stationery shop sold 1 pen for $6. For every 3 pens sold, an additional pen would be given free. If Mrs Kong spent $72 on the pens, how many pens did she receive in total?
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A stationery shop sold 1 pen for $6. For every 3 pens sold, an additional pen would be given free. If Mrs Kong spent $72 on the pens, how many pens did she receive in total?