Uncle Wang went to the market to buy 102 kilograms of three kinds of fruits, including 55 kilograms of pears and 9 kilograms more apples than bananas. How many kilograms to buy bananas?
王叔叔到市场买三种水果共102千克，其中买梨子55千克，买苹果比香蕉多9千克．买香蕉多少千克？
<gadget id="calculator">102 - 55</gadget>
<output>47</output>

<gadget id="calculator">47 - 9</gadget>
<output>38</output>

<gadget id="calculator">38 / 2</gadget>
<output>19</output>

<result>19</result>