In a class, boys stand in a single line. One of the boys is nineteenth in order from both ends. How many boys are there in the class?
Answer & explanation
Correct answer: option 2
The correct answer is Option (2) → 37
The boy is 19th from the front, so 18 boys stand in front of him; he is also 19th from the back, so 18 boys stand behind him.
Total \(=18+1+18=37\)
Tip: When one person's position is known from both ends, total \(=\) position from one end \(+\) position from the other end \(-1\); the person is counted twice otherwise.