Four circle having equal radii are drawn with centres at the four corners of a square. Each circle touches the other two adjacent circles. If the remaining area of the square is 168 cm², what is the size of the radius of the circle?(in cm)

Directions (next five questions): What approximate value will come in place of the question mark (?) in the given questions

Directions (next five questions) : Study the table to answer the given questions.

Data regarding number of candidates appearing for 

Civil Services (CS) and Engineering Services (ES)

Examinations in the years 2007, 2008, 2009 and

2010 in the country XYZ

 (Note : Figures with regards to total number of candidates appeared are given in thousands)