Xiaoming bought 4 catties of apples for 16 yuan, and Xiaoli is going to buy 9 catties of apples. How much will it cost?
小明花16元买了4斤苹果，小丽准备买9斤苹果，要花多少钱？
<gadget id="calculator">16 / 4</gadget>
<output>4</output>

<gadget id="calculator">4 * 9</gadget>
<output>36</output>

<result>36</result>