Quantitative Aptitude - Arithmetic Ability Questions

A man travels 50 km at speed 25 km/h and next 40 km at 20 km/h and there after travel 90km at 15 km/h. His average speed is

A shopkeeper by selling 9 Rolex watches, earns a profit equal to the selling price of 4 Rolex watches. His profit percentage is

To dispose of the old stocks, a person sold a tea-set for Rs. 3420, which was 43% below the cost price. In order to make a profit of 10% the seller should have sold the set for Rs. ___ more.

What will be the net discount percentage of three successive discounts of 20%, 10% and 30%?

If L : M = 3 : 5 and M : N = 2 : 3, then N : L = ?

What is the value of Sin 30° + 2 Cos 30° ?

If xa+b+1=xa-b+a-ba+b, then x is equal to

Deepak sells all his goods available in his shop at the cost price, but he cheats his customer and gives 20% less goods as he should give. Find his % profit.