The number A is 63, which is 6 more than three times the number B, and the number B = how much.
甲数是63，比乙数的3倍多6，乙数=多少．
<gadget id="calculator">63 - 6</gadget>
<output>57</output>

<gadget id="calculator">57 / 3</gadget>
<output>19</output>

<result>19</result>