Group A gives 12 books to Group B, and A has 4 more books than B. How many books did A have more than B?
甲组给乙组12本图书，甲比乙还多4本，甲原来比乙多多少本．
<gadget id="calculator">12 * 2</gadget>
<output>24</output>

<gadget id="calculator">24 + 4</gadget>
<output>28</output>

<result>28</result>