A, B, and C take the train at the same time and carry a total of 100 kilograms of luggage. A pays 1.10 yuan for the luggage, B pays 0.70 yuan, and C pays 0.60 yuan. If A’s luggage is shared between B and C, B will pay Pay 1.70 yuan, and C has to pay 1.90 yuan. How much is the free luggage per person?
甲、乙、丙三人同时乘火车并共带行李100千克，行李费甲付1.10元，乙付0.70元，丙付0.60元，如果甲的行李分给乙、丙两人带，则乙要付1.70元，丙要付1.90元．每人的免费行李是多少千克？
<gadget id="calculator">1.7 + 1.9</gadget>
<output>3.6</output>

<gadget id="calculator">3.6 * 100</gadget>
<output>360</output>

<gadget id="calculator">1.1 + 0.7 + 0.6</gadget>
<output>2.4</output>

<gadget id="calculator">2.4 * 100</gadget>
<output>240</output>

<gadget id="calculator">360 - 240</gadget>
<output>120</output>

<gadget id="calculator">3.6 * 3</gadget>
<output>10.8</output>

<gadget id="calculator">2.4 * 2</gadget>
<output>4.8</output>

<gadget id="calculator">10.8 - 4.8</gadget>
<output>6</output>

<gadget id="calculator">120 / 6</gadget>
<output>20</output>

<result>20</result>