A pair of table tennis rackets is 16 yuan, buy 6 pairs and get 2 pairs free, buy 6 pairs at a time, how much is each pair cheaper?
一副乒乓球拍16元，买6副送2副，一次买6副，每副便宜几元？
<gadget id="calculator">6 + 2</gadget>
<output>8</output>

<gadget id="calculator">6 / 8</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">16 * (3/4)</gadget>
<output>12</output>

<gadget id="calculator">16 - 12</gadget>
<output>4</output>

<result>4</result>