Discussion
30 persons are sitting in a row. Find the number of persons sitting between 9th person from left and 16th person from right.
Answer: D
There are 5 persons between them.
Convert the position from the right into a position from the left. In a row of 30, the 16th from the right is
\[ 30 - 16 + 1 = 15\text{th from the left} \]
The people strictly between the 9th and the 15th from the left are in places 10 to 14:
\[ 15 - 9 - 1 = 5 \]
4 is what you get by forgetting the + 1 and taking the 16th from the right as 14th from the left; 8 and 3 do not follow from either position. A quick check: places 1 to 9, the 5 between, and places 15 to 30 (16 people) make 9 + 5 + 16 = 30.
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