The rice factory uses the same plastic bag to pack rice, each bag holds 20 kg. On the first day, 2,600 kilograms were installed, and on the second day, 3,180 kilograms were installed. How many fewer bags were filled on the first day than on the second day?
大米厂用同样的塑料袋装大米，每袋装20千克．第一天装了2600千克，第二天装了3180千克．第一天比第二天少装多少袋？
<gadget id="calculator">3_180 / 20</gadget>
<output>159</output>

<gadget id="calculator">2_600 / 20</gadget>
<output>130</output>

<gadget id="calculator">159 - 130</gadget>
<output>29</output>

<result>29</result>