I think I know the answer but would like to hear the forum's answer. What was the logic was in getting at the answer? Also, I copy pasted this from an actual exam so no need to wonder if there was a typo or anything.
The probability that a visit to a primary care physician’s (PCP) office results in neither lab work nor referral to a specialist is 35%. Of those coming to a PCP’s office, 30% are referred to specialists and 40% require lab work. Determine the probability that a visit to a PCP’s office results in both lab work and referral to a specialist.