A, B, C, and D make a total of 370 parts. If A makes 10 more parts and B makes 20 fewer parts, the number of parts made by C is multiplied by 2, and the number of parts made by D is divided by 2, then the four parts The number of parts made is exactly equal. How many parts did B actually make?
甲、乙、丙、丁四人共做零件370个，如果甲多做10个，乙少做20个，丙做的个数乘2，丁做的个数除以2，那么这四个人所做的零件数恰好相等．乙实际做了多少个零件．
<gadget id="calculator">370 - 20</gadget>
<output>350</output>

<gadget id="calculator">10 + 350</gadget>
<output>360</output>

<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">1 + 1 + (1/2) + 2</gadget>
<output>9/2 = around 4.5</output>

<gadget id="calculator">360 / (9/2)</gadget>
<output>80</output>

<gadget id="calculator">80 + 20</gadget>
<output>100</output>

<result>100</result>