Three natural numbers, the ratio of A to B is 3:5, the ratio of B to C is 4:7, the sum of these three numbers is 201, what is A
三个自然数，甲与乙的比是3：5，乙与丙的比是4：7，这三个数的和是201，甲是多少
<gadget id="calculator">12 + 20 + 35</gadget>
<output>67</output>

<gadget id="calculator">12 / 67</gadget>
<output>12/67 = around 0.179104</output>

<gadget id="calculator">201 * (12/67)</gadget>
<output>36</output>

<result>36</result>