Bunuel wrote:

How many patients can a group of dermatologists diagnose in one day?

(1) Two dermatologists can diagnose 3 patients in 1.5 hours.

(2) Dermatologists work for 8 hours a day.

Stat 1 : Two dermatologists can diagnose 3 patients in 1.5 hours...here we are not sure how many hours the dermatologists work in one day is not given...Insufficient.

Stat 2: Dermatologists work for 8 hours a day....Here we are not sure the number of patients they diagnose..hence insufficient.

Stat 1 + Stat 2 : Two dermatologists can diagnose 3 patients in 1.5 hours

Then in 8 hours they diagnose = 3*8 /1.5 = 16 patients..Sufficient..

IMO C is correct option..

OA please...will correct if I missed anything...