A store sells several pens of 23 yuan and 16 yuan for a total income of 500 yuan, so how many of these two pens are sold in total?
某商店卖出若干23元和16元一支的钢笔共收入500元，那么这两种钢笔共卖出多少只．
<gadget id="calculator">12 + 14</gadget>
<output>26</output>

<result>26</result>