The ratio of the numbers A and B is 7:5, the number of A is 91, what is the number of B?
甲、乙两数的比是7：5，甲数是91，乙数是多少．
<gadget id="calculator">91 / 7</gadget>
<output>13</output>

<gadget id="calculator">13 * 5</gadget>
<output>65</output>

<result>65</result>