Quantitative Aptitude - Arithmetic Ability Questions

The mean score in a test of the 12 boys in a class was 16 while the overall mean of the 30 students in the class was 18.1. What was the mean score of the girls?

The value of tan80° tan10° + sin270° + sin20∘

In the following question, select the odd number group from the given alternatives.

What should be added to 3(x­ - 2y) to obtain 2(3x + y) -­ 5(2x + 3)?

If cot 60° + cosec 60° = x, then the value of x is

Reflection of the point (4,-5) in the y-axis is

In triangle PQR, A is the point of intersection of all the altitudes and B is the point of intersection of all the angle bisectors of the triangle. If ∠PBR =105°, then what is the value of ∠PAR (in degrees)?

A solid brass sphere of radius 2.1 dm is converted into a right circular cylindrical rod of length 7cm. The ratio of total surface areas of the rod to the sphere is