The sum of the three numbers A, B, and C is 200, the number A is 80, and the ratio of the numbers B to C is 5:7, what is the number B?
甲乙丙三个数之和是200，甲数是80，乙数和丙数的比是5：7，则乙数是多少
<gadget id="calculator">200 - 80</gadget>
<output>120</output>

<gadget id="calculator">5 + 7</gadget>
<output>12</output>

<gadget id="calculator">5 / 12</gadget>
<output>5/12 = around 0.416667</output>

<gadget id="calculator">120 * (5/12)</gadget>
<output>50</output>

<result>50</result>