farm actually remodeled 10.5 hectares of saline-alkali land, which was 5% more than the original plan. How many hectares of saline-alkali land were actually remodeled than originally planned?
某农场实际改造盐碱地10.5公顷，比原计划多改造5%，实际比原计划多改造盐碱地多少公顷？
<gadget id="calculator">5 / 100</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">1 + (1/20)</gadget>
<output>21/20 = around 1.05</output>

<gadget id="calculator">10.5 / (21/20)</gadget>
<output>10</output>

<gadget id="calculator">10.5 - 10</gadget>
<output>0.5</output>

<result>0.5</result>