Quantitative Aptitude - Arithmetic Ability Questions

If sec2A cosec2A = x, then x is

If x = a + 1a, y = a - 1a ,(a>0), then the value of x4+y4-2x2y2 is

At what rate of compound interest per annum will a sum of Rs 20000 become Rs 25088 in 2 years?

Select the related word/letters/number from the given alternatives.
1 : 8 :: ? :64

In a mixture, water and milk are in the ratio of 3 : 5. In the second mixture, the ratio of water and milk is 9 : 11. If these two mixtures be mixed to form anew mixture in which water and milk are in ratio 5 : 7, then what is the ratio of these two mixtures in the new mixture?

Of the 3 numbers whose average is 40, the first is 1/3 rd the sum of other 2. What is the first number?

The mean of marks secured by 60 students in division A of class X is 66, 45 students of division B is 62 and that of 75 students of division C is 60. Find the mean of marks of the students of three divisions of Class X.

The average height of 50 bats is 126 cm. Some bats of average height 120 cm are removed. If the new average height is 130 cm, then how many bats are remaining?