Grandma Wang bought a 4-meter-long red rope to weave a Chinese knot. To weave a Chinese knot, one needs to use 105 centimeters of red rope. After weaving two Chinese knots, how many centimeters are left on the red rope?
王奶奶买了一根4米长的红绳子编中国结，结编一个中国结要用红绳子105厘米，编好2个中国结后，这根红绳子还剩多少厘米？
<gadget id="calculator">4 * 100</gadget>
<output>400</output>

<gadget id="calculator">105 * 2</gadget>
<output>210</output>

<gadget id="calculator">400 - 210</gadget>
<output>190</output>

<result>190</result>