Quantitative Aptitude - Arithmetic Ability Questions

In which of the following quadrilaterals opposite angles are supplementary?

A flask has two holes. The 1st hole alone makes the flask empty in 9 minutes and 2nd hole alone makes the flask empty in 16 minutes. If water leaks out at a constant rate, how long in minutes does it take if both the holes together empty the flask?

Which of the following equations has 3 as a root?

A man, rowing a boat, covers a distance of 16 km in two hours downstream. He covers half the distance in same amount of time when rowing upstream. Calculate the speed of the stream.

The sum of a non-zero number and twenty times its reciprocal is 9. What is the number?

If 2sec2x - tan2x = 5 and 0° ≤ x ≤ 90°, then x = ?

The sum of the lengths of the edges of a cube is equal to half the perimeter of a square. If the numerical value of the volume pf the cube is equal to one-sixth of the numerical value of the area of the square, then the length of one side of the square is

Find the mean of the first 6 prime numbers?