A pair of table tennis rackets is 12 yuan, buy 5 get 1 free, buy 5 pairs at a time, how much is each pair cheaper?
一副乒乓球拍12元，买5送1副，一次买5副，每副便宜几元？
<gadget id="calculator">5 + 1</gadget>
<output>6</output>

<gadget id="calculator">5 / 6</gadget>
<output>5/6 = around 0.833333</output>

<gadget id="calculator">12 * (5/6)</gadget>
<output>10</output>

<gadget id="calculator">12 - 10</gadget>
<output>2</output>

<result>2</result>