UPSC CSE Prelims 2020
The total number of boys in the row can be determined by establishing the position of a common individual from both ends of the row.
Using 'G's position from both ends, the total number of boys in the row is calculated as:
Total boys = (Position of 'G' from left) + (Position of 'G' from right) - 1
Total boys = 27 + 15 - 1 = 42 - 1 = 41.
Alternatively, by summing the segments:
Total boys = 15 + 1 + 10 + 1 + 14 = 41.
The problem provides sufficient data to precisely determine the number of boys in the row. Options 1 (40) and 3 (42) would result from miscalculations, such as errors in determining relative positions or incorrect application of the formula for total individuals in a linear arrangement. Option 4 ('Cannot be determined due to insufficient data') is incorrect as the given information allows for a definitive calculation of the total number of boys.