Zhang Jun took 35 yuan to buy stationery, and spent 4/7 of the money on pencils, and the remaining money was exactly 6 yuan to buy the same eraser. How much is each eraser?
张军带了35元钱去买文具，买铅笔用去了所带钱的(4/7)，余下的钱正好买6块同样的橡皮．每块橡皮多少元？
<gadget id="calculator">4 / 7</gadget>
<output>4/7 = around 0.571429</output>

<gadget id="calculator">1 - (4/7)</gadget>
<output>3/7 = around 0.428571</output>

<gadget id="calculator">(3/7) / 6</gadget>
<output>1/14 = around 0.071429</output>

<gadget id="calculator">35 * (1/14)</gadget>
<output>5/2 = around 2.5</output>

<result>5/2 = around 2.5</result>