For two rapeseed fields, the first field is fertilized (7/20) tons, and the second field is fertilized (1/20) tons more. How many tons are fertilized in the two fields?
两块油菜地，第一块施肥(7/20)吨，比第二块多施肥(1/20)吨，两块地共施肥多少吨？
<gadget id="calculator">7 / 20</gadget>
<output>7/20 = around 0.35</output>

<gadget id="calculator">1 / 20</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">(7/20) - (1/20)</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">(3/10) + (7/20)</gadget>
<output>13/20 = around 0.65</output>

<result>13/20 = around 0.65</result>