The germination rate of a kind of seed is 98%, and there are 686 germinated seeds now, how many such seeds should be prepared at the beginning.
一种种子的发芽率为98%，现在有发芽的种子686粒，则当初应准备多少粒这样的种子．
<gadget id="calculator">98 / 100</gadget>
<output>49/50 = around 0.98</output>

<gadget id="calculator">686 / (49/50)</gadget>
<output>700</output>

<result>700</result>