The ratio of the number A to the number B is 5:6, the number B is 12 more than the number A, what is the number A?
甲数与乙数的比是5：6，乙数比甲数多12，甲数是多少．
<gadget id="calculator">6 - 5</gadget>
<output>1</output>

<gadget id="calculator">12 / 1</gadget>
<output>12</output>

<gadget id="calculator">12 * 5</gadget>
<output>60</output>

<result>60</result>