If a/b=9...9, b represents the smallest two-digit number, what is a.
如果a/b=9…9，b表示最小的两位数，a是多少．
<gadget id="calculator">9 * 10</gadget>
<output>90</output>

<gadget id="calculator">90 + 9</gadget>
<output>99</output>

<result>99</result>