Pencils, colored pens, and ballpoint pens in a stationery store are sold in a pencil case in three ways. Five pencils in the pencil case sell for 5 yuan; six colored pens and 3 ballpoint pens in the same pencil case sell for 10 yuan. Still put 6 colored pens and 3 ballpoint pens in this stationery box, plus 3 pencils for 11.5 yuan; if you put 3 pencils, 2 colored pens and 1 ballpoint pen in this stationery box, then the selling price should be how much.
某文具店中的铅笔，彩色笔，圆珠笔用三种方式搭配在文具盒内出售，文具盒内装5支铅笔售5元；在同一种文具盒内装6支彩色笔和3支圆珠笔售10元，仍在这种文具盒内装6支彩色笔和3支圆珠笔，再加上3支铅笔售11.5元；如果在这种文具盒内装3支铅笔，2彩色笔和1支圆珠笔，那么售价应该是多少元．
<gadget id="calculator">11.5 - 10</gadget>
<output>1.5</output>

<gadget id="calculator">1.5 / 3</gadget>
<output>0.5</output>

<gadget id="calculator">0.5 * 5</gadget>
<output>2.5</output>

<gadget id="calculator">5 - 2.5</gadget>
<output>2.5</output>

<gadget id="calculator">10 - 2.5</gadget>
<output>7.5</output>

<gadget id="calculator">7.5 / 3</gadget>
<output>2.5</output>

<gadget id="calculator">3 * 0.5</gadget>
<output>1.5</output>

<gadget id="calculator">2.5 + 1.5 + 2.5</gadget>
<output>6.5</output>

<result>6.5</result>