On the first day, 64 hectares were plowed, accounting for exactly 2/7 of the total. On the second day, the remaining 70% was plowed. How many acres are left unplowed?
一抉地第一天耕了64公亩，恰好占总数的(2/7)，第二天耕了余下的70%，还剩多少公亩没耕？
<gadget id="calculator">2 / 7</gadget>
<output>2/7 = around 0.285714</output>

<gadget id="calculator">64 / (2/7)</gadget>
<output>224</output>

<gadget id="calculator">224 - 64</gadget>
<output>160</output>

<gadget id="calculator">70 / 100</gadget>
<output>7/10 = around 0.7</output>

<gadget id="calculator">160 * (7/10)</gadget>
<output>112</output>

<gadget id="calculator">160 - 112</gadget>
<output>48</output>

<result>48</result>