The sum of the two numbers of A and B is 677. If A is reduced by 19, the number of A is 13 times the number of B. Find the number of B.
甲、乙两数的和是677，如果甲减少19，甲数就是乙数的13倍，求乙数．
<gadget id="calculator">677 - 19</gadget>
<output>658</output>

<gadget id="calculator">13 + 1</gadget>
<output>14</output>

<gadget id="calculator">658 / 14</gadget>
<output>47</output>

<result>47</result>