A piece of rectangular cultivated land is 100 meters long and 50 meters wide. It is necessary to dig four waterlogging canals along the direction parallel to the length. How wide should be dug?
一块长方形耕地长100米，宽50米，要在这块地上沿与长平行的方向挖4条排涝水渠，如果水渠的宽都相等，而且要保证余下的可耕面积为4600平方米，那么水渠应挖多宽？
<gadget id="calculator">100 * 50</gadget>
<output>5_000</output>

<gadget id="calculator">5_000 - 4_600</gadget>
<output>400</output>

<gadget id="calculator">100 * 4</gadget>
<output>400</output>

<gadget id="calculator">400 / 400</gadget>
<output>1</output>

<result>1</result>