Quantitative Aptitude - Arithmetic Ability Questions

If x + y = 10 and x2 + y2 = 68, then find xy

What is the fourth proportional to 72, 168 and 150?

On a certain principal if the Simple interest for two years is Rs 3000 and Compound interest for the two years is Rs 3225, what is the rate of Interest?

A dishonest shopkeeper professes to sell goods at his cost price but uses a false weight of 950 gms, for each kilogram. His gain percentage is

The average age of 120 members of a society is 60.7 years. By addition of 30 new members, the average age becomes 56.3 years. What is the average age (in years) of newly joined members?

If 10 people can do a job in 20 days,then 20 people with twice the efficiency can do the same job in

By increasing the price of entry ticket to a fair in the ratio 5:7, the number of visitors to the fair has decreased in the ratio 11:9. In what ratio has the total collection increased or decreased?