The total weight of students A and B is 130 kg, and their weight ratio is 6:7. How many kilograms is the heaviest classmate?
甲、乙两个同学体重总和是130千克，他们的体重比是6：7．最重的一个同学达多少千克？
<gadget id="calculator">6 + 7</gadget>
<output>13</output>

<gadget id="calculator">7 / 13</gadget>
<output>7/13 = around 0.538462</output>

<gadget id="calculator">130 * (7/13)</gadget>
<output>70</output>

<result>70</result>