Quantitative Aptitude - Arithmetic Ability Questions

If secθ + tanθ = 4, then secθ - tanθ = ?

If 1/(1 + cosA) + 1/(1 ­- cosA) = x , then value of x is

Average age of 6 boys is 14 years. Average age of 11 girls is 12 years. What is the average age (in years) of all boys and girls?

A right circular conical structure stands on a circular base of 21m diameter and is 14m in height. The total cost of colour washing for its curved surface at Rs. 6 per sq. m. is
(Take Π = 22/7 )

A, B and C can complete a work in 20, 24 and 30 days respectively. All three of them starts together but after 4 days A leaves the job and B left the job 6days before the work was completed. C completed the remaining work alone. In how many days was the total work completed?

Two pipes, when working one at a time can fill a cistern in 2 hrs and 3 hrs, respectively while a third pipe can drain the cistern empty in 6 hrs. All the three pipes were opened together when the cistern was 1/6 full. How long will it take for the cistern to be completely full?

The S.P of a washing machine is 1 1/3 of its C.P. Find the gain percent.

The product of two decimals is 0.768. If one of the decimal number is 1.6, find the other.