The ratio of A to B is 2:7, B is 49, how much is A?
甲与乙的比是2：7，乙是49，求甲是多少？
<gadget id="calculator">49 / 7</gadget>
<output>7</output>

<gadget id="calculator">7 * 2</gadget>
<output>14</output>

<result>14</result>