The sum of A and B is 200. The number A is three times the number B. What is the number of A?
甲数与乙数的和是200．甲数是乙数的3倍．甲数是多少．
<gadget id="calculator">3 + 1</gadget>
<output>4</output>

<gadget id="calculator">200 / 4</gadget>
<output>50</output>

<gadget id="calculator">200 - 50</gadget>
<output>150</output>

<result>150</result>