Xiaohong walks with her father, her father walks big, Xiaohong walks small, her father takes 3 steps and Xiaohong takes 5 steps to keep up, they start with their left foot at the same time, and when their father walks 100 steps, they both lift out their right foot at the same time. How many times are there feet?
小红和爸爸一起散步，爸爸步大，小红步小，爸爸走3步小红走5步才能跟上，他们同时用左脚起步，到爸爸走了100步时，两人同时抬出右脚共有多少次？
<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">100 * (3/5)</gadget>
<output>60</output>

<result>60</result>