Mom bought 12 pencils for Tiantian, and paid a total of 8 yuan and 40 cents, how much is each pencil.
妈妈为甜甜买了12支铅笔，共付了8元4角，每支铅笔多少．
<gadget id="calculator">4 / 10</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">8 + (2/5)</gadget>
<output>42/5 = around 8.4</output>

<gadget id="calculator">(42/5) / 12</gadget>
<output>7/10 = around 0.7</output>

<result>7/10 = around 0.7</result>