Quantitative Aptitude - Arithmetic Ability Questions

cot2A + cos2A is equal to

If a/b = c/d = e/f = 2/5, then what is (5a + 3c + 2e) : (5b + 3d + 2f)?

In the following question, select the odd letters from the given alternatives.

A and B together can complete a task in 12 days. However, if A works alone, completes half the job and leaves and then B works alone and competes the rest of the work, it takes 25 days in all to complete the work. If B is more efficient than A, how many days would it have taken B to do the work by herself?

To cover a distance of 225 km in 2.5 hours what should be the average speed of the car in meters/second?

The average of a,b,c is 20 and that of b,c,d is 25; if d=30, then the value of a is

In the given figure, in triangle STU, ST = 8 cm,TU = 9 cm and SU = 12 cm. QU = 24 cm, SR = 32 cm and PT = 27 cm. What is the ratio of the area of triangle PQU and area of triangle PTR?

Selling price of a watch is Rs 966 and profit percentage is 15%. If selling price is Rs 798, then what will be the loss percentage?