In a row of trees, a pine tree is the 7th tree from the left end and the 14th tree from the right end. How many trees are there in total in this row?

Answer and explanation

Correct answer: A. 20 trees

  1. Step 1: Count the position from both ends: Position from left = 7; position from right = 14.
  2. Step 2: Total trees = (position from left) + (position from right) - 1 (since the pine tree is counted twice).
  3. Step 3: Calculate: 7 + 14 - 1 = 21 - 1 = 20 trees.
Answer
20 trees.
Why not the others: '21 trees' forgets to subtract 1 for the double-counted pine tree; '19 trees' subtracts 2; '22 trees' adds 1.

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