Quantitative Aptitude - Arithmetic Ability Questions

If A's salary is 40% less than that of B, then how much percent is B's salary more than that of A?

If cosec4A -­ cosec2A = x, then value of x is?

The ratio of number of boys and girls in a class is 2 : 3. The average weight of boys and girls in the class is 18 kg and 21 kg respectively. What is the average weight (in kgs) of all the boys and girls together?

The sum of twice a number and thrice its reciprocal is 25/2. What is the number?

If A, B and C together do a job in 4 days, A and C together do the job in 4.5 days and B and C together do the job in 12 days then in how many days can C alone do the job?

A and B have to type a book together containing 120 pages. A takes 9 hrs to type 36 pages and B takes 5 hrs to type 40 pages. A typed first 60 pages alone and the last 60 pages were typed by A and B together. How much time (in hours) will be taken to type the complete book?

If m+n=1, then the value of m3+n3+3mnis equal to

If x3 – y3 = 81 and x – y = 3, then what is the value of x2 + y2?