The capacity of a large cup is three times that of a small cup, and a large cup is 200 ml larger than a small cup. What is the capacity of a small cup in milliliters?
一只大杯的容量是一只小杯的3倍，一只大杯比一只小杯大200毫升，小杯的容量是多少毫升．
<gadget id="calculator">3 - 1</gadget>
<output>2</output>

<gadget id="calculator">200 / 2</gadget>
<output>100</output>

<result>100</result>