There are some chess pieces in the box, if you take 11 pieces each time, there are still 10 pieces left, if you take 9 pieces each time, the number of times you take the same as the first time, then there are 28 pieces left. How many pieces were there originally in the box?
盒子里有一些棋子，若每次取11粒，则还剩下10粒，若每次取9粒，取的次数与第一次相同，则剩下28粒．盒子里原来有多少粒棋子？
<gadget id="calculator">28 - 10</gadget>
<output>18</output>

<gadget id="calculator">11 - 9</gadget>
<output>2</output>

<gadget id="calculator">18 / 2</gadget>
<output>9</output>

<gadget id="calculator">11 * 9</gadget>
<output>99</output>

<gadget id="calculator">99 + 10</gadget>
<output>109</output>

<result>109</result>