Quantitative Aptitude - Arithmetic Ability Questions

What is the average of all the one digit and two digit natural numbers?

The average marks obtained by a group of 16 students was 20. One student left the group as a result of which the average of the remaining students rose to 21. But another student joined, as a result of which the average marks of the group dropped a bit and became 20.5. What was the average marks obtained by the student who left and the one who joined?

A sum fetched a total simple interest of Rs. 8100 at the rate of 6% per year in 9 years. What is the sum?

A can do a piece of work in 20 days and B in 15 days. With help of C, they finish the work in 5 days. C can alone do the work in

O is the orthocentre of∆ABC, and if ∠BOC = 110° then ∠BAC will be

A dealer is selling an article at a discount of 5% on the Marked price. If the Marked price is 12% above the cost price and the article was sold for Rs. 532 then the cost price is (in Rs.)

AB is a diameter of a circle. C is a point on the tangent drawn at A . If AB = 8 cm and AC = 6 cm , then the length of BC is

By selling a table for Rs. 16,870, a shopkeeper suffers a loss of Rs. 1080. His loss percentage (rounded off to one decimal place) is