If a two-digit number becomes one decimal after adding a decimal point, the number will be reduced by 45 from the original. What is the two-digit number?
一个两位数，如果添上小数点后，变成一位小数，这个数就比原来减少45，这个两位数是多少．
<gadget id="calculator">10 - 1</gadget>
<output>9</output>

<gadget id="calculator">45 / 9</gadget>
<output>5</output>

<gadget id="calculator">5 * 10</gadget>
<output>50</output>

<result>50</result>