Quantitative Aptitude - Arithmetic Ability Questions

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

A total amount of Rs. 1560 is to be divided among A, B, C such that A gets 50% of what B gets and B gets 20% of what C gets. How much will B get ?

How many times in a week does both the hands of the clock will coincide with each other?

If a and b are the roots of the equation Px2 – Qx + R = 0, then what is the value of (1/a2) + (1/b2) + (a/b) + (b/a)?

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%?

If sec (3x – 20°) = cosec (3y + 20°), then what is the value of tan (x + y)?

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