Find the difference between mean and median in the given data 2.5, 4.6, 7.2, 3.3, 4.9, 5.6, 2.7?

A and B together can do a piece of work in 16 days and B and C together can do the same work in 24 days. From starting A and B worked for 4 days and 7 days respectively, when A lefts the work then C joins the work and he works for 23 days and complete the work. Then find in how many days will C complete the work alone?

A does half as much work as B in one-third of the time taken by B. If together they take 10 days to complete a work, then the time take by B alone to do it would have been__

If is a positive acute angle and 5 cosθ + 12 sinθ = 13, then find the value of cosθ?

Directions: Study the following table carefully to answer the questions that follow .
Number of soldiers ( in thousands ) joining five different forces during six different.

What was the average number of soldiers joining all the forces together in the year 2007? 

The area of a circle is proportional to the square of its radius. A small circle of radius 3 cm is drawn within a larger circle of radius 5 cm. Find the ratio of the difference between the area of the larger circle and that of the smaller circle to the area of the larger circle.

What will be the area (cm²) of the curved surface of an elliptical cylinder whose height and diameter are 10 cm and 8 cm respectively?

If $${{k^2}\over {k^2-2k+1}}={1\over 6}$$, then what is the value of $${1\over k^3}+k3$$ ?