If a decimal moves its decimal point one place to the right, it will be 22.5 more than the original number. What is the original number?
一个小数如果把它的小数点向右移动一位，比原数多22.5，原来这个小数是多少．
<gadget id="calculator">10 - 1</gadget>
<output>9</output>

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

<result>2.5</result>