The red cup can hold 380 milliliters of water, which is 80 milliliters less than twice that of the blue cup. What is the capacity of the blue cup in milliliters?
红杯子可盛380毫升水，比蓝杯子的2倍少80毫升，蓝杯子的容量是多少毫升？
<gadget id="calculator">380 + 80</gadget>
<output>460</output>

<gadget id="calculator">460 / 2</gadget>
<output>230</output>

<result>230</result>