In a row, A is 10th from the left and B is 9th from the right. When they interchange their positions, A becomes 15th from the left. How many persons are there in the row?
Answer and explanation
Correct answer: D. 23
- Step 1: After interchanging, A occupies B's former position.
- Step 2: This position is 15th from the left and was 9th from the right.
- Step 3: Total persons in row = .
Answer
23.
Why not the others: 22 subtracts an extra person; 24 forgets to subtract the common position; and 25 adds both left ranks.
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