The school bought a bundle of rope, used 150 meters on the first day, 50 meters more than the second day, and left 120 meters after using it for 2 days, how many meters is this bundle of rope?
学校买来一捆绳子，第一天用去150米，比第二天多50米，用2天后还剩120米，这捆绳子有多少米．
<gadget id="calculator">150 - 50</gadget>
<output>100</output>

<gadget id="calculator">100 + 150 + 120</gadget>
<output>370</output>

<result>370</result>