The ratio of A and B is 7:5, and the average of these two numbers is 36, so how much more is A than B?
甲、乙两数的比是7：5，这两个数的平均数是36，则甲数比乙数多多少．
<gadget id="calculator">7 + 5</gadget>
<output>12</output>

<gadget id="calculator">2 / 12</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">7 - 5</gadget>
<output>2</output>

<gadget id="calculator">36 * (1/6) * 2</gadget>
<output>12</output>

<result>12</result>