Quantitative Aptitude - Arithmetic Ability Questions

If cot 240° = x, then the value of x is

If 3x + 2 < 2x + 1 and x ­- 4 ≤ 2x -­ 1; then x can take which of the following values?

What is the perimeter of the sector whose central angle is 60° and radius of the circle is 21 cm?

If √x ­- √y = 1 , √x + √y = 17 then √xy = ?

A number is greater than twice its reciprocal by 31/4. Find the number.

The angle of elevation of the top of a tower, vertically erected in the middle of a paddy field, from two points on a horizontal line through the foot of the tower are given to be α and β (α>β). The height of the tower is h unit. A possible distance (in the same unit) between the points is

The median of the data -3, 4, 0, 4, -2, -5, 1, 7, 10, 5 is

Some masons promised to do a work in 10 days but 8 of them were absent and remaining did the work in 18 days. What was the original number of masons?