A rectangle is 70 cm long and 30 cm wide. If this rectangle is divided into squares of equal size and as large an area as possible without residue, how many such squares can be divided into?
一个长方形，长70厘米，宽30厘米，把这个长方形分成大小相等、面积尽可能大的正方形且没有剩余，可以分成多少个这样的正方形？
<gadget id="calculator">2 * 5</gadget>
<output>10</output>

<gadget id="calculator">70 / 10</gadget>
<output>7</output>

<gadget id="calculator">30 / 10</gadget>
<output>3</output>

<gadget id="calculator">7 * 3</gadget>
<output>21</output>

<result>21</result>