What should come at place of question mark (?) in the following number series?

15 20 50 165 680 ? 

If the perimeter of a rectangle is 24cm with length being twice as its breadth, find its area.

Study the given graph carefully to answer the questions that follow:

What is the total number of days that carpenter Z will take to make one piece each of all the four items together?

Directions: The following table represents the percentage marks of four students in six subjects.
Consider the table and answer questions based on it

Who has the highest total marks?

Five women can do a work in thirty six days. If the ratio between the capacity of a man and a woman is 3:1, then find how many days it will take 5 men to complete the same work?

Travelling at 60 km/h, a person reaches his destination in certain time. He covers 60% of his journey in 2/5^th of the time. At what speed (in km/h) should he travel to cover the remaining journey so that he reaches the destination right on time ?

Point A (2, 1) divides segment BC in the ratio 2 : 3. Co-ordinates of B are (1, -3 ) and C are (4 , y). What is the value of y ? 

Neena and Meena started a business with investment of Rs. 30,000 and Rs. 45, 000 Respectively. What will be the share of Meena from the profit of Rs.1,50,000 after  2 years?