Question
A bookstore sold 1 marker for $3. For every 3 markers sold, an additional marker would be given free. If Mrs Yang spent $18 on the markers, how many markers did she receive in total?
4 m

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A bookstore sold 1 marker for $3. For every 3 markers sold, an additional marker would be given free. If Mrs Yang spent $18 on the markers, how many markers did she receive in total?