Quantitative Aptitude - Arithmetic Ability Questions

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?

X and Y undertook to do a piece of work for Rs 5400. X alone could do this work in 18 days and Y alone could do this work in 24 days. With the assistance of Z they finished the work in 8 days. What is the share (in Rs) of Z?

S does half as much work as T in 1/7 of the time taken by T. If together they take 21 days to complete a work, then how may days shall S take to complete that work alone?

At 24% discount the selling price of a washing machine is Rs 38000, what is the selling price if the discount is 40%?

x and y are two numbers such that their mean proportion is 8 and third proportion is 512. What is the value of x and y?

The value of cos220°+cos270° is

If 3sinθ+4cosθ=5 (0<θ<90°) then the value of sinθ is

By selling 175 pineapples, the gain is equal to the selling price of 50 pineapples. What is the gain percentage?