There are 60 students in a school of whom 35 study chemistry and 30 study physics. 12 out of those students study biology and chemistry but not physics. 10 study chemistry but neither biology nor physics. 11 study only physics and neither biology nor chemistry. 10 also study chemistry and physics only. Find (1) how many students study all the 3 subjects. (2) how many students study biology and physics but not chemistry. (3) How many students study biology only. (4) How many students study biology altogether
