How many 0.1s are subtracted from 23.5 to get the largest one-digit natural number.
从23.5里减去多少个0.1，才能得到一个最大的一位自然数．
<gadget id="calculator">23.5 - 9</gadget>
<output>14.5</output>

<gadget id="calculator">14.5 / 0.1</gadget>
<output>145</output>

<result>145</result>