A, B, C, and D made a total of 370 parts. If the number made by A is added by 10, the number made by B is subtracted by 20, the number made by C is multiplied by 2, and the number made by D is If the number is divided by 2, the number of parts made by the four people is exactly equal. So how many parts did B actually make?
甲、乙、丙、丁四人一共做了370个零件，如果把甲做的个数加10个，乙做的个数减去20个，丙做的个数乘以2，丁做的个数除以2，四人做的零件数就正好相等．那么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>