Quantitative Aptitude - Arithmetic Ability Questions

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

Mahesh buys a watch of Rs 300 and sells it. Mahesh gives two successive discount of 15% and 6% to the buyer. What will be the selling price (in Rs) ofthe watch?

At 22% discount the selling price of a refrigerator is Rs 26000, what is the selling price if the discount is 40%?

If 2x + 3y = 0 and 3x ­- 4y = 34, then x ­- y = ______

If a + b = 10 and ab = 21, then the value of (a - b)2 is

In a class, 60% of children like Mathematics, 45% like Science and 25% like both Mathematics and Science. What is the percentage of children who like at least one subject?

If A is 40% more than B, then B is how much percent less than A?

If(x + y)2 = xy + 1 and x3 – y3 = 1, then what is the value of x – y?