Party A, Party B, Party C and Party D jointly process a batch of parts. The parts processed by Party A are half of the total number processed by others, and the parts processed by Party B are one third of the total number processed by others, The parts processed by C are 1 / 5 of the total number processed by others, while the parts processed by D are 30 less than the total number processed by the other three people?

30÷【1-1/（1+2）-1/（1+3）-1/（1+5）】
=30÷【1-1/3-1/4-1/6】
=30÷1/4
=120

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