Choose the correct picture from the below options that fits the blank space.

A 4.0 kg object is moving horizontally with a speed of 5.0 m/s. To increase its speed to 10 m/s, the amount of net work required to be done on this object is:

Ramesh sold a phone at a loss of 5%. Had he sold it for Rs. 200 more, he would have gained 15%. To gain 25%, he should sell it for :

In a computer game, there are builders and destroyers. Together there are 20 of them.

Some of them try to build a wall around castle while the rest try to demolish it. Each of the builders can build the wall alone in 15 hours while any of the destroyers can demolish it in 10 hours.If all 20 builders and destroyers are made active whenthere is no wall and the wall gets built in 3 hours, how many of them are destroyers?

The ratio of chairs to tables in an office is 9 : 7. If there are 42 more chairs than tables, find the number of chairs in the office.