There is a batch of rice stored in the grain depot, half of the stored rice is shipped out for the first time, more than 20 packs, and the remaining half of the rice is shipped out for the second time, less than 10 packs. At this time, there are still 28 packs left. How many packs of rice are there in the grain depot? ?
粮库里存一批大米，第一次运出库存大米的一半多20包，第二次运出剩下大米的一半少10包，这时还剩28包，求粮库原有大米多少包？
<gadget id="calculator">28 - 10</gadget>
<output>18</output>

<gadget id="calculator">18 * 2</gadget>
<output>36</output>

<gadget id="calculator">36 + 20</gadget>
<output>56</output>

<gadget id="calculator">56 * 2</gadget>
<output>112</output>

<result>112</result>