A car transports a batch of chemical fertilizers, 30 tons on the first day, and the remaining 40 tons on the second day, what fraction of the fertilizer is transported on the first day?
一辆汽车运一批化肥，第一天运走30吨，第二天运走余下的40吨，第一天运走这批化肥的几分之几？
<gadget id="calculator">30 + 40</gadget>
<output>70</output>

<gadget id="calculator">30 / 70</gadget>
<output>3/7 = around 0.428571</output>

<result>3/7 = around 0.428571</result>