There are two colored ribbons 60 cm and 75 cm long respectively. Cut them into small pieces of equal length. How many pieces can be cut at least?
有两条彩带分别长60厘米和75厘米，把他们剪成长度相等的小段，最少可以剪多少段．
<gadget id="calculator">3 * 5</gadget>
<output>15</output>

<gadget id="calculator">60 / 15</gadget>
<output>4</output>

<gadget id="calculator">75 / 15</gadget>
<output>5</output>

<gadget id="calculator">4 + 5</gadget>
<output>9</output>

<result>9</result>