The teachers and students of the fifth grade donated 145 books to Hope Primary School, which is 2/7 less than that of the sixth grade. How many books were donated by the teachers and students of the fifth and sixth grades?
五年级师生向希望小学捐书145本，比六年级少捐(2/7)，五、六年级师生共捐书多少本？
<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">145 / (5/7)</gadget>
<output>203</output>

<gadget id="calculator">203 + 145</gadget>
<output>348</output>

<result>348</result>