The fruit shop shipped some fruits, of which 16 boxes were not apples, and 28 boxes were not oranges. There were 32 boxes of apples and oranges. How many boxes of apples were there in these fruits?
水果店运来一些水果，其中16箱不是苹果，28箱不是桔子，苹果和桔子共有32箱，这些水果中苹果有多少箱．
<gadget id="calculator">28 - 32</gadget>
<output>-4</output>

<gadget id="calculator">16 + (-4)</gadget>
<output>12</output>

<gadget id="calculator">12 / 2</gadget>
<output>6</output>

<gadget id="calculator">28 - 6</gadget>
<output>22</output>

<result>22</result>