Xinxin Gym has opened. Xiaohong goes to the gym every 4 days, and Xiaoice goes to the gym every 5 days. May I ask: After Xiaohong and Xiaobing meet in the gym, how many days are they likely to meet again in the gym?
新新健身房开张了，小红每4天去健身一次，小冰每5天去一次，请问：小红和小冰健身房相遇后，第几天她们有可能会再次在健身房相遇？
<gadget id="calculator">5 * 4</gadget>
<output>20</output>

<result>20</result>