There is a rope, 45% of it is used on the first day, and (1/5) is used on the second day, and there are still 70 meters left. How many meters is the total length of this rope?
有一条绳子，第一天用去45%，第二天用去(1/5)，还剩下70米，这条绳子全长多少米？
<gadget id="calculator">45 / 100</gadget>
<output>9/20 = around 0.45</output>

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

<gadget id="calculator">1 - (9/20) - (1/5)</gadget>
<output>7/20 = around 0.35</output>

<gadget id="calculator">70 / (7/20)</gadget>
<output>200</output>

<result>200</result>