Quantitative Aptitude - Arithmetic Ability Questions

What is the sum of the first 13 terms of an arithmetic progression if the 5th term is 1 and the 8th term is -17?

Marked price of an item is Rs 300. On purchase of 2 items discount is 24%, on purchase of 5 items discount is 38%. Rachna buys 7 items, what is the effective discount?

ABC is a right angled triangle with angle A = 90 deg. Then the value of cos2A+cos2B+cos2C is

What will be the average of all the prime numbers before 19?

The average of 17 results is 60. If the average of first 9 results is 57 and that of the last 9 results is 65, then what will be the value of 9th result?

The slope of the line passing through the points (-5,1) and (x,-4) is -5/8. Find x.

Three angles of a quadrilateral are 60°,90°and 100°. Then the fourth angle of the quadrilateral is

Atul and Binay together complete a piece of work in 5 days. If Binay alone can complete the same work in 8 days, how many days Atul take to complete the same work alone?