Quantitative Aptitude - Arithmetic Ability Questions

Point Q(-1,b) is the midpoint of segment EF. Co-ordinates of point E are (-4,a) and point F are (2,0). What is the value of a and b?

The ratio of present ages of R and S is 6:7. Before 12 years the ratio of their ages was 9:11. What is R's present age (in years)?

If x + (1/x) = 2, then what is the value of x21 + (1/x1331)?

If a3+ b3 = 19 and a + b = 1, then what is the value of ab?

If Gangadhar's salary is 3/11 times of Hari's and Shambhu's is 3/4 times of Hari's, what is the ratio of Gangadhar's salary to Shambhu's?

Marked price of an item is Rs 200. On purchase of 1 item discount is 22%, on purchase of 4 items discount is 33%. Rabia buys 5 items, what is the effective discount?

An object travels 23 m in 3 s and then another 15 m in 2 s. What is the average speed of the object?

To cover a distance of 234 km in 1.6 hours what should be the average speed of the car in meters/second?