The average marks of a student in an examination is 63, if he had scored 20 marks in geography and 2 more marks in history, his average marks would have been 65. How many subjects were there in the exam?

A bar graph showing the height of six mountain peaks. Study the bar graph and answer the following Questions.

How much percentage is more than Peak A From Peak F?

If A: B=7: 9 and B:C =5 :6 then value of A:C

The average weight of 24 students is 35 kg. If the weight of teacher is added the average increased by 400 gram. What is the weight of the teacher?

If the ratio of speed of train, car and bus is 6:5:3 and bus cover a distance of 240 km. in 4 hours. What is the difference between speed of the train and car?

If tan π then the value of x is : 

Ramu sees a train passing over a 1 km long bridge. The length of the train is half that of the bridge. If the train clears the bridge in 2 min, the speed of the train is – 

If , then what is the value of a?