A rectangular iron sheet with a length of 105 cm and a width of 75 cm is to be cut into square iron sheets of exactly the same size without any surplus. How many square iron sheets can this rectangular iron sheet be cut into at least?
一张长105厘米、宽75厘米的长方形铁皮，要裁成大小完全相等的正方形铁皮且无剩余，这张长方形铁皮最少可以裁成多少个正方形铁皮？
<gadget id="calculator">3 * 5</gadget>
<output>15</output>

<gadget id="calculator">15 * 15</gadget>
<output>225</output>

<gadget id="calculator">75 / 225</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">105 * (1/3)</gadget>
<output>35</output>

<result>35</result>