Question
A book shop sold 1 pen for $3. For every 3 pens sold, an additional pen would be given free. If Mrs Hun spent $27 on the pens, how many pens did she receive in total?
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A book shop sold 1 pen for $3. For every 3 pens sold, an additional pen would be given free. If Mrs Hun spent $27 on the pens, how many pens did she receive in total?