Quantitative Aptitude - Arithmetic Ability Questions

What is the simplified value of [(sec3x – tan3x)/(sec x – tan x)] – 2 tan2x – sec x tan x?

Anil can do a piece of work in 14 days which Rohit can do in 21 days. They worked together for few days after which Anil left. If Rohit worked alone for 3 days, find the total number of days it took to complete the whole work.

If the profit is 20%, then what will be the ratio of cost price to selling price respectively?

Among three numbers, the first is twice the second and thrice the third. If the average of three numbers is 396, then what is the difference between the first and the third number?

10 is added to a certain number, the sum is multiplied by 7, the product is divided by 5 and 5 is subtracted from the quotient. The remainder left is half of 88. What is the number?

If a+bab=21 ,  then the value of (a-b) is

Select the odd word/letters/number/number pair from the given alternatives.

If cos 45° - ­ sec 30° = x, then value of x is