Master Wang repaired the flower bed. He originally planned to repair 15 meters per day, which can be completed in 12 days. In fact, he repaired 6 meters less per day. How many days did Master Wang actually finish repairing the flower beds?
王师傅修花坛，原计划每天修15米，12天可以修完，实际每天少修6米．王师傅实际几天修完花坛？
<gadget id="calculator">15 - 6</gadget>
<output>9</output>

<gadget id="calculator">12 / 9</gadget>
<output>4/3 = around 1.333333</output>

<gadget id="calculator">15 * (4/3)</gadget>
<output>20</output>

<result>20</result>