Xiaofang collected 10 sets of animal pictures, 4 in each set, and gave 16 to her classmates. How many are left?
小芳收集了10套动物画片，每套4张，送给同学16张，还剩多少张？
<gadget id="calculator">4 * 10</gadget>
<output>40</output>

<gadget id="calculator">40 - 16</gadget>
<output>24</output>

<result>24</result>