The number A is 14.9, which is 4.6 greater than the number B. What is the average of the two numbers A and B?
甲数是14.9，比乙数大4.6，甲、乙两数的平均数是多少．
<gadget id="calculator">14.9 - 4.6</gadget>
<output>10.3</output>

<gadget id="calculator">10.3 + 14.9</gadget>
<output>25.2</output>

<gadget id="calculator">25.2 / 2</gadget>
<output>12.6</output>

<result>12.6</result>