Pour the full pot of water (1/5) into a cup, and it is still less than 10cm**3. If you pour the full pot of water (1/4) into this cup, it will overflow by 25cm**3. Find the volume of this cup.
将满壶水的(1/5)倒入一个杯子里，还差10cm**3未满，若将满壶水的(1/4)倒入这个杯子里，则溢出25cm**3．求这个杯子的容积．
<gadget id="calculator">10 + 25</gadget>
<output>35</output>

<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">(1/4) - (1/5)</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">35 / (1/20)</gadget>
<output>700</output>

<gadget id="calculator">700 * (1/5)</gadget>
<output>140</output>

<gadget id="calculator">140 + 10</gadget>
<output>150</output>

<result>150</result>