Number A is 35, and its ratio to Number B is 7:9. What is Number B?
甲数是35，它和乙数比是7：9，乙数是多少？
<gadget id="calculator">35 / 7</gadget>
<output>5</output>

<gadget id="calculator">5 * 9</gadget>
<output>45</output>

<result>45</result>