A rectangular piece of paper is 7 decimeters 5 centimeters long and 6 decimeters wide. Now it is necessary to cut it into squares, and the side length of the square is an integer number of centimeters and there is no surplus. If the area of the cut square is to be the largest, how many pieces can be cut.
一张长方形的纸，长7分米5厘米、宽6分米．现在要把它裁成一块块正方形，而且正方形边长为整厘米数且没有剩余，如果要使裁得的正方形面积最大，可以裁多少块．
<gadget id="calculator">6 * 10</gadget>
<output>60</output>

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

<gadget id="calculator">60 / 225</gadget>
<output>4/15 = around 0.266667</output>

<gadget id="calculator">75 * (4/15)</gadget>
<output>20</output>

<result>20</result>