Wang Qing bought 6 notebooks and 4 ballpoint pens for 22 yuan. 1.9 yuan per ballpoint pen, how much is each notebook?
王青买了6本笔记本和4枝圆珠笔，共用去22元．每枝圆珠笔1.9元，每本笔记本多少钱？
<gadget id="calculator">4 * 1.9</gadget>
<output>7.6</output>

<gadget id="calculator">22 - 7.6</gadget>
<output>14.4</output>

<gadget id="calculator">14.4 / 6</gadget>
<output>2.4</output>

<result>2.4</result>