The bookstore shipped 700 story books, sold 2/7 of the total in the morning and 1/5 of the total in the afternoon, how many books are left unsold?
书店运来故事书700本，上午卖出总数的(2/7)，下午卖出总数的(1/5)，还剩多少本没卖？
<gadget id="calculator">2 / 7</gadget>
<output>2/7 = around 0.285714</output>

<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 - (2/7) - (1/5)</gadget>
<output>18/35 = around 0.514286</output>

<gadget id="calculator">700 * (18/35)</gadget>
<output>360</output>

<result>360</result>