The fifth grade of a primary school donated 300 books to the Sichuan disaster area, the sixth grade donated less than the fifth grade (1/6), how many books did the sixth grade donate?
某小学五年级向四川灾区捐书300本，六年级比五年级少捐(1/6)，六年级捐书多少本？
<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">1 - (1/6)</gadget>
<output>5/6 = around 0.833333</output>

<gadget id="calculator">300 * (5/6)</gadget>
<output>250</output>

<result>250</result>