Quantitative Aptitude - Arithmetic Ability Questions

What is the measure of an interior angle of a regular dodecagon?

The successive discount of 15%, 20% and 25% on an article is equivalent to the single discount of

If tan (5x ­- 10°) = cot (5y + 20°), then the value of x + y is

A flask has two holes. The 1st hole alone makes the flask empty in 9 minutes and 2nd hole alone makes the flask empty in 16 minutes. If water leaks out at a constant rate, how long in minutes does it take if both the holes together empty the flask?

The mean of marks secured by 35 students in division A of class X is 65, 45 students of division B is 61 and that of 70 students of division C is 59. What is the mean of marks of the students of three divisions of Class X?

Mohan starts to calculate sum of all odd natural number less than 83. What result does he get?

An angle is smaller than its supplementary by 30°. What is the measure of the angle?

If the sum of the measures of all the interior angles of polygon is 1800°, find the number of sides of the polygon?