The ratio of A and B is 5:7, A's number is 65, what is B's number?
甲、乙两数的比是5：7，甲数是65，乙数是多少．
<gadget id="calculator">65 / 5</gadget>
<output>13</output>

<gadget id="calculator">13 * 7</gadget>
<output>91</output>

<result>91</result>