Digging a 200-kilometer canal, the full length (1/4) was dug in the first week, and the full length (1/5) was dug in the second week. How many kilometers did you dig in two weeks?
挖一条200千米的水渠，第一周挖了全长的(1/4)，第二周挖了全长的(1/5)．两周一共挖了多少千米？
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">200 * (1/4)</gadget>
<output>50</output>

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

<gadget id="calculator">200 * (1/5)</gadget>
<output>40</output>

<gadget id="calculator">50 + 40</gadget>
<output>90</output>

<result>90</result>