The 16th Asian Games will be held in Guangzhou, China from November 12 to 27, 2010. Guangzhou is the second city in China to obtain the right to host the Asian Games. At that time, the number of gymnasiums in Guangzhou will reach 72, which is 20% more than the original number of gymnasiums. How many gymnasiums are there in Guangzhou?
第16届亚运会于2010年11月12日至27日再中国广州进行，广州是中国第二个取得亚运会主办权的城市．届时广州的体育馆数量达72个，比原来体育馆数量增加20%，广州原有体育馆多少个？
<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 + (1/5)</gadget>
<output>6/5 = around 1.2</output>

<gadget id="calculator">72 / (6/5)</gadget>
<output>60</output>

<result>60</result>