your first class

Out of 80 students who secured first class marks in Matchematics or in Physics , 50 obtained first class marks in Mathematics and 10 in both Physics and Mathematics. How many students secured first class marks in Physics only ?

One day, the ratio of the number of first class and second class passengers who travelled were in the ratio 1:30. the ratio of the first and second class fares is 3:1. the total amount collected from the passerngers that day was Rs 66000. find the amount collected from the first class passengers (in Rs)

Ratio of First ,Second and Third Class train fares between two stations was 8:6:3 .First Class and Second Class train fares are reduced by 1/6 and 1/12 repectively .Ratio of no of passengers in first, second and third class in a year is 4:9:24 .From a stattion total sale of ticket of Rs. 355600 .First the amount collected from first class .

The ratio of the rail fares of first class and second class between the stations is 3:1 .The ratio of first class passenger and second class passengers is 1:50 .One day Rs. 1,325 is received as rail fare from passengers travelling both sides then the fare received from second class passangers is ?

How many students passed in first class ? Statements: I. 85% of the students who appeared in examination have passed either in first class or in second class. II. 750 students have passed in seond class. III. The number of students who passed in first class is 28% of those passed in second class.