Six years ago, the ratio of ages of A to B was 7 : 5. After 4 years from now, the ratio of their ages will be 11 : 9. What is A’s age at present?

A train passes a 100 meters long platform in 28 seconds and a man standing on the platform in 20 seconds. The speed of the train is:

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?

A is twice as efficient as B in writing novels. Together they can complete the task of writing a novel in 24 days. In how many days can A write the novel alone?

The angle of elevation of the top of a tree 220 metres high from two points lies on the same plane are 30° and 45°. What is the distance (in metres) between the two points?

If the arithmetic mean of 6, 8, 10. x, 7 is 8.the value of x will be

If (2, 0) is a solution of the linear equation 2x + 3y = 5, then the value of k is: 

A shopkeeper gives 12 percent additional discount along with a discount of 20 percent on the marked price of a radio. If the selling price of the radio is ₹ 704, the marked price is