There is a batch of chemical fertilizers in the warehouse. After being shipped out (3/7), another 20 tons of fertilizers are transported in. At this time, the amount of chemical fertilizers in the warehouse is 5 tons more than before. How many tons of fertilizers are there in the warehouse?
仓库有一批化肥，运出(3/7)后，又运进20吨，这时仓库里的化肥比原来还多5吨，仓库原有化肥多少吨？
<gadget id="calculator">20 - 5</gadget>
<output>15</output>

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

<gadget id="calculator">15 / (3/7)</gadget>
<output>35</output>

<result>35</result>