Quantitative Aptitude - Arithmetic Ability Questions

In a class consisting of boys and girls, there are 45 students. If three fifth of the students are boys, find the number of boys in the class.

A boat is moving away from an observation tower. It makes an angle of depression of 60° with an observer's eye when at a distance of 50m from the tower. After 8 sec., the angle of depression becomes 30°. By assuming that it is running in still water, the approximate speed of the boat is

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

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

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

Neeraj purchased a few shirts for his shop at cost prices ranging from Rs. 400 to Rs. 550 and sold at prices ranging from Rs. 450 to Rs. 650. What is the maximum profit that might be made in selling 10 shirts?

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