There are 40 large and small plastic bottles in the box, with a total weight of 110 grams. Each of the large balls weighs 4 grams, and each of the small balls weighs 2 grams. How many fewer large balls are there than the small ones.
盒子里有大、小两种塑料瓶共40个，一共重110克，大球每个重4克，小球每个重2克，则大球比小球少多少个．
<gadget id="calculator">4 * 40</gadget>
<output>160</output>

<gadget id="calculator">160 - 110</gadget>
<output>50</output>

<gadget id="calculator">4 - 2</gadget>
<output>2</output>

<gadget id="calculator">50 / 2</gadget>
<output>25</output>

<gadget id="calculator">40 - 25</gadget>
<output>15</output>

<gadget id="calculator">25 - 15</gadget>
<output>10</output>

<result>10</result>