In the 29th Beijing Olympic Games, the Chinese sports team won a total of 100 medals, including 51 gold medals. The number of silver medals accounted for 3/7 of the total number of silver and bronze medals. How many silver medals did the Chinese sports team win?
第29届北京奥运会，中国体育代表队共获奖牌100枚，其中金牌51枚，银牌数占银牌和铜牌总数的(3/7)，中国体育代表队获得多少枚银牌？
<gadget id="calculator">100 - 51</gadget>
<output>49</output>

<gadget id="calculator">3 / 7</gadget>
<output>3/7 = around 0.428571</output>

<gadget id="calculator">49 * (3/7)</gadget>
<output>21</output>

<result>21</result>