The fifth grade teachers and students donated 140 books to Hope Primary School, the fifth grade donated less than the sixth grade (2/7), how many books did the sixth grade teachers and students donate?
五年级师生向希望小学捐书140本，五年级比六年级少捐(2/7)，六年级师生捐书多少本？
<gadget id="calculator">2 / 7</gadget>
<output>2/7 = around 0.285714</output>

<gadget id="calculator">1 - (2/7)</gadget>
<output>5/7 = around 0.714286</output>

<gadget id="calculator">140 / (5/7)</gadget>
<output>196</output>

<result>196</result>