The tractor plowed 45% of the land in the morning, and 4.8 hectares more in the afternoon than in the morning, which was just finished. How many acres is this land?
拖拉机耕地，上午耕这块地的45%，下午比上午多耕4.8公亩，正好耕完．这块地共多少公亩？
<gadget id="calculator">45 / 100</gadget>
<output>9/20 = around 0.45</output>

<gadget id="calculator">1 - (9/20) - (9/20)</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">4.8 / (1/10)</gadget>
<output>48</output>

<result>48</result>