There are 780 books in the school. The fifth grade borrowed (1/5) and the sixth grade borrowed (5/12). How many books are left?
学校有780本图书，五年级借去了(1/5)，六年级借去了(5/12)，还剩下多少本图书？
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">5 / 12</gadget>
<output>5/12 = around 0.416667</output>

<gadget id="calculator">1 - (1/5) - (5/12)</gadget>
<output>23/60 = around 0.383333</output>

<gadget id="calculator">780 * (23/60)</gadget>
<output>299</output>

<result>299</result>