The ratio of the numbers of A and B is 7:5, the number of A is 14 more than the number of B, what is the number of A?
甲乙两数的比7：5，甲数比乙数多14，甲数是多少．
<gadget id="calculator">7 - 5</gadget>
<output>2</output>

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

<gadget id="calculator">7 * 7</gadget>
<output>49</output>

<result>49</result>