Xiaowei and Xiaoqiang bought the same number of books with the same amount of money. Later, Xiaowei took 13 books, Xiaoqiang took 7 books, and Xiaowei gave Xiaoqiang 1 yuan and 5 cents. How much is each book like this.
小伟和小强拿同样多的钱买同样多的本子，后来，小伟拿了13本，小强拿了7本，小伟给了小强1元5角钱，这样的本子每本多少角钱．
<gadget id="calculator">5 / 10</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">1 + (1/2)</gadget>
<output>3/2 = around 1.5</output>

<gadget id="calculator">13 - 7</gadget>
<output>6</output>

<gadget id="calculator">6 / 2</gadget>
<output>3</output>

<gadget id="calculator">(3/2) / 3</gadget>
<output>1/2 = around 0.5</output>

<result>1/2 = around 0.5</result>