Quantitative Aptitude - Arithmetic Ability Questions

Find k, if the line 4x - y = 1 is perpendicular to the line 5x - ky = 2?

Manish is four times as efficient as Puneet. Manish takes 90 days less than Puneet to complete a book. If both of them work together, then in how many days the book will be completed?

If 10% loss is made on selling price, then the rate of loss on the cost price will be

A trader had 12 quintals of wheat. He sold a part of it at 13% profit and the rest at 23% profit, so that he made a total profit of 17 %. How much wheat did he sell at 23% profit?

A man travelled a distance of 60 km in 7 hours. He travelled partly on foot @ 6 km/hr and partly on bicycle @ 12 km/hr. What is the distance (in kms) travelled on foot?

If x - y = 6 and xy = 40, then find x2 + y2 ?

If cos ­-11π/6 = x, then the value of x is

Mr. Murthy invested Rs. 16,000 in a scheme. How much will he get on matuirity, if he invested it at 20% per annum C.I. for 9 months, compounded quarterly?