The sum of the numbers A and B is 16, the ratio of A and B is 3:5, what is the number of A
甲、乙两数的和是16，甲、乙的比是3：5，甲数是多少
<gadget id="calculator">3 + 5</gadget>
<output>8</output>

<gadget id="calculator">3 / 8</gadget>
<output>3/8 = around 0.375</output>

<gadget id="calculator">16 * (3/8)</gadget>
<output>6</output>

<result>6</result>