The ratio of number A to number B is 2:5, and the ratio of number B to number C is 4:7. Given that number A is 16, find the sum of the three numbers A, B, and C.
甲数和乙数的比是2：5，乙数和丙数的比是4：7，已知甲数是16，求甲、乙、丙三个数的和是多少．
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">16 / (2/5)</gadget>
<output>40</output>

<gadget id="calculator">4 / 7</gadget>
<output>4/7 = around 0.571429</output>

<gadget id="calculator">40 / (4/7)</gadget>
<output>70</output>

<gadget id="calculator">16 + 40 + 70</gadget>
<output>126</output>

<result>126</result>