Which number among the following does not belong to the series 8, 27, 50, 125, 343?

The monthly salaries of A, B and C are in the ratio 2 : 3 : 5. If C's monthly salary is ₹ 12,000 more than that of A, then B's annual salary is 

In an examination, 30 percent of the students failed in English and 25 percent of the students failed in mathematics. If 15 percent of the candidates failed in both subjects, then what percentage of students passed in both subject.

The Ajmer express can move at 45 km./hr. without its rake and the speed is diminished by a constant that varies as the square root of the number of wagons attached. If it is known that with 9 wagons, the speed is 30 km./hr., what is the greatest number of wagons with which the train can just move?

Study the following graph and answer the question that follow.
What is the respective ratio between the number of candidates who have failed from institute B and the number of candidates who have appeared from institute F?

The area bounded by the lines x = 0, y = 0, x + y = 1, 2x + 3y = 6 (in square units) is 

A sum of money is invested at 20 % compound interest (compounded annually). It would fetch 723 more if interest is compound half-yearly. The sum is –

What approximate value should come in place of the question mark (?) in the following question? 
21.9714 × (8.8749 - 4.9393) = ?