Quantitative Aptitude - Arithmetic Ability Questions

If x=2+3,then the value of x2-x+1x2+x+1 is

A and B have their annual average income Rs. 80,000.
B and C have their annual average income Rs. 75,000.
C and A have their annual average income Rs. 78,000.

The annual income of A is ?

A's salary was decreased by 50% and subsequently increased by 50%. How much percent does he lose?

Area of 4 walls of a cuboid 400 sq cm, its length is 15 cm and height is 8 cm. What is its breadth (in cm)?

The co-ordinates of the centroid of a triangle ABC are (3,-2). What are the co-ordinates of vertex C if co-ordinates of A and B are (-2,5) and (6,-2) respectively?

What is the value of (1/2) Sec 30° + √2 Tan 60°?

What is the reflection of the point (6, -1) in the line y = 2?

What is the value of ( 1/3 + cosec30)?