Quantitative Aptitude - Arithmetic Ability Questions

What is the average of all numbers between 11 and 80 which are divisible by 6?

Sum of three consecutive integers is 51 . The middle one is:

Three consecutive natural numbers are such that the square of the greatest is greater than the product of the other two by 16. The smallest of these numbers is

An equilateral triangle ABC is inscribed in a circle of radius 20√3.
What is the length of the side of the triangle?

At 24% discount the selling price of a washing machine is Rs 38000, what is the selling price if the discount is 40%?

What is the effective discount on two successive discounts of 20% and 25%?

A Rs 100 shirt is offered at 10% discount and a Rs 300 pair of trousers at 20% discount. If Pritam bought 1 shirt and 3 pairs of trousers, what is the effective discount (in %) he got?

If cotA = x, then the value of x is