The number A is multiplied by 2.5, the product is 13.5 more than the number A, what is the product?
甲数乘2.5，积比甲数多13.5，积是多少．
<gadget id="calculator">2.5 - 1</gadget>
<output>1.5</output>

<gadget id="calculator">13.5 / 1.5</gadget>
<output>9</output>

<gadget id="calculator">9 * 2.5</gadget>
<output>22.5</output>

<result>22.5</result>