Discussion
Gagan is 73rd from the left end of the row and 79th from the right end of the same row of students. How many students are there in the row?
Answer: B
Gagan is 73rd from the left and 79th from the right, so the row has 73 + 79 - 1 = 151 students. The student is counted once in each position, which is why one is subtracted.
\[ 73 + 79 - 1 = 151 \]
The options 152, 153 and 154 are what one gets by counting Gagan twice or adding extra students. Counting the places to the left (72) and to the right (78) of Gagan and then adding Gagan himself gives 72 + 78 + 1 = 151, which checks the answer.
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