The ratio of two numbers A and B is 3:8, the difference between the two numbers is 15, what is the sum of the two numbers.
甲、乙两数的比是3：8，两数的差是15，两数的和是多少．
<gadget id="calculator">3 + 8</gadget>
<output>11</output>

<gadget id="calculator">8 / 11</gadget>
<output>8/11 = around 0.727273</output>

<gadget id="calculator">3 / 11</gadget>
<output>3/11 = around 0.272727</output>

<gadget id="calculator">(8/11) - (3/11)</gadget>
<output>5/11 = around 0.454545</output>

<gadget id="calculator">15 / (5/11)</gadget>
<output>33</output>

<result>33</result>