A, B, and C make a total of 1600 parts. What A completes is the sum of B and C (1/3). B makes 50 more parts than A. How many parts does B make?
甲、乙、丙三人共做1600个零件，甲完成的是乙、丙之和的(1/3)，乙比甲多做了50个，乙做了多少个零件？
<gadget id="calculator">1 + 3</gadget>
<output>4</output>

<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1_600 * (1/4)</gadget>
<output>400</output>

<gadget id="calculator">400 + 50</gadget>
<output>450</output>

<result>450</result>