There are 5 rice test fields in a certain village. Compared with last year, the harvest of each test field is as follows (increase is positive, and decrease is negative): 50 kg, -35 kg, 20 kg, -15 kg, -5 kg. How is the total output of the rice test field this year compared with last year?
某村共有5块水稻试验田，每块试验田今年的收成与去年相比情况如下(增产为正，减产为负)：50千克，-35千克，20千克，-15千克，-5千克．今年水稻试验田的总产量与去年相比情况如何？
<gadget id="calculator">55 + 20</gadget>
<output>75</output>

<gadget id="calculator">50 + (-35) + 20 + (-15) + (-5)</gadget>
<output>15</output>

<gadget id="calculator">-15</gadget>
<output>-15</output>

<gadget id="calculator">(-35) + (-15) + (-5)</gadget>
<output>-55</output>

<gadget id="calculator">75 + (-55)</gadget>
<output>20</output>

<result>20</result>