Preliminary Exam CSAT December 06

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MCQ
GS

1. A survey of 400 doctors passed out from the city's premier medical college in last five years shows that 142 joined government service, 160 took up private practice and 120 joined nursing home as junior doctor. 40 of them who joined the government service also had private practice, 32 of them worked as junior doctor and had private practice. 20 of them worked in government services as well as in nursing homes. 12 of them worked in all the three areas.

Assuming that the statement is true, which among the given alternatives the follows from the statement?