The average of the two numbers of A and B is 18.4, and A is 4 more than B, then what is A
甲、乙两数的平均数是18.4，甲比乙多4，则甲是多少
<gadget id="calculator">18.4 * 2</gadget>
<output>36.8</output>

<gadget id="calculator">36.8 + 4</gadget>
<output>40.8</output>

<gadget id="calculator">40.8 / 2</gadget>
<output>20.4</output>

<result>20.4</result>