A rectangular piece of paper is 75 cm long and 60 cm wide. If you want to cut this piece of paper into small squares with the same area and no surplus, and make the side length the longest, how many pieces can you cut?
一块长方形的纸，长75厘米，宽60厘米．要把这张纸裁成面积相等的小正方形的纸而无剩余，且使边长最长，问可裁成几张？
<gadget id="calculator">3 * 5</gadget>
<output>15</output>

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

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

<gadget id="calculator">5 * 4</gadget>
<output>20</output>

<result>20</result>