Quantitative Aptitude - Arithmetic Ability Questions

What is the equation of a line having a slope -1/3 and y-intercept equal to 6?

What should be the missing digit so that the number 275_476 becomes exactly divisible by 11?

The average age of 30 boys in a class is 10 years. If the age of their teacher is also included, the average increases by one year. The teacher's age in years is

Among three numbers, the first is twice the second and thrice the third. If the average of three numbers is 396, then what is the difference between the first and the third number?

The ratio of present ages of Ramita and Satyajit is 9:7. After 9 years the ratio of their ages will be 5:4. What is Ramita's present age?

A mixture of 240 litres of juice and water contains 15% water. How much more water (in litres) should be added to this so that the strength of water will become 25% in the new mixture?

What will be the next set of numbers in the series? (2,3), (3,5), (5,7), (7,11), (11,13), ___

The diagonal of a square is 12 cm what is the length (in cm) of its side?