Quantitative Aptitude - Arithmetic Ability Questions

What will be the sum of the measures all the interior angles of a polygon having 14 sides?

The average of 5 members of a family is 24 years. If the youngest member is 8 years old, then what was the average age (in years) of the family at the time of the birth of the youngest member?

The mean of 10 observations is 17. One more observation is included and the new mean becomes 16. The 11th observation is

A cricketer, whose bowling average was 12.4 runs/wicket takes 5 wickets for 22 runs in a match, thereby decreases his average by 0.4. The number of wickets, taken by him before this match was:

An exterior angle of a triangle is 115 deg and one of the interior opposite angle is 45 deg. Then the other two angles are

The simplified value of 3-212-18 - 13 × 27 - 12 x 273 is closest to

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

What is the slope of the line perpendicular to the line passing through the points (-5 , 1) and (-2 , 0)?