Panu, Jiban and Jalil can complete a certain task individually in 30, 20 and 60 days, respectively. Jiban started work on the task and Panu and Jalil agreed to help Jiban on every third day. How many days will it take to complete the task?

Three numbers are such that if the average of any two of them is added to the third number, the sums obtained are 168, 174 and 180 respectively. What is the average of the original three numbers?

A corner of a cube of side length 8 m. When cut by a plane which bisects the sides of the cube, we get a pyramid whose volume is : 

If (x + k ) is the common factor of x² + ax + b and x² + cx + d , then what is k equal to ?

If AD, BE and CF are medians of ∆ABC, then which one of the following statements is correct? 

In ∆ABC, ∠B is a right angle, AC = 6cm, and D is the mid-point of AC. The length of BD is:

If the number x3339 is divisible by 11, what is the face value of x?

$$\sqrt{x}÷ \sqrt{144} = 0.02, $$ then the value of x is