In the following figure, rectangle represents Technicians, circle represents Bakers, triangle represents Playwrights and square represents Gymnasts. Which set of letters represents Technicians who are Bakers?
The mean of marks secured by 45 students in division A of class X is 56, 40 students of division B is 52 and that of 40 students of division C is 50. Find the mean of marks of the students of three divisions of Class X.