Buying 5 notebooks and 3 pencils cost 10.4 yuan in total. It is known that each pencil is 0.9 yuan. How much is each notebook?
买5个本子和3支铅笔一共用去10.4元，已知铅笔每支0.9元，每本子多少元？
<gadget id="calculator">0.9 * 3</gadget>
<output>2.7</output>

<gadget id="calculator">10.4 - 2.7</gadget>
<output>7.7</output>

<gadget id="calculator">7.7 / 5</gadget>
<output>1.54</output>

<result>1.54</result>