and B want to download the same 100M software from the Internet. They use their computers at home to download at the same time. A’s network speed is faster, and the download speed is 5 times that of B. Due to a network failure, the network was disconnected, but the network of the second family has been normal. When A's network returns to normal, continue to download to 99 megabytes (the downloaded part does not need to be re-downloaded), and B has finished downloading, how many megabytes did B download during A's disconnection?
甲、乙二人要从网上下载同一个100兆大小的软件，他们同时用各自家中的电脑开始下载，甲的网速较快，下载速度是乙的5倍，但是当甲下载了一半时，由于网络故障出现断网的情况，而乙家的网络一直正常．当甲的网络恢复正常后，继续下载到99兆时(已经下载的部分无需重新下载)，乙已经下载完了，则甲断网期间乙下载了多少兆．
<gadget id="calculator">50 / 100</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">100 * (1/2)</gadget>
<output>50</output>

<gadget id="calculator">50 / 5</gadget>
<output>10</output>

<gadget id="calculator">99 - 50</gadget>
<output>49</output>

<gadget id="calculator">49 / 5</gadget>
<output>49/5 = around 9.8</output>

<gadget id="calculator">100 - 10 - (49/5)</gadget>
<output>401/5 = around 80.2</output>

<result>401/5 = around 80.2</result>