Uncle Wang went to the grain store to buy rice. The careless Uncle Li mistakenly undercounted one bag by 20 kilograms, and overcounted the other bag by 3 kilograms. The total sold to Uncle Wang was 100 kilograms. How many kilograms of rice did Uncle Wang actually buy?
王大爷去粮店买米，粗心的李叔叔错把一袋少算了20千克，另一袋多算了3千克，合计卖给王大爷100千克，王大爷实际买米多少千克．
<gadget id="calculator">20 - 3</gadget>
<output>17</output>

<gadget id="calculator">100 + 17</gadget>
<output>117</output>

<result>117</result>