Quantitative Aptitude - Arithmetic Ability Questions

A can do a piece of work in 10 days and B in 12 days. With help of C, they finish the work in 4 days. In how many days C alone can do the same work?

10 Consecutive numbers are given. If the average of the two numbers given in the middle is 13.5, then what is the sum of the first 6 numbers?

If xy = 48 and x2 + y2 = 100, then (x + y) is

A tyre is sold at three successive discounts of 20%,30%, and 20%. What is the net discount (in percentage)

On dividing 24a2b2 by 6b2, we will get

∆PQR is right angled at Q. If sinP = 12/13, then what is the value of tanR?

A home theatre set is Rs. 4950. If two successive discounts of 20% and 15% are given, then its selling price is

The standard deviation of the set {10, 11, 9, 11, 9} is