In a school assembly, students stand in one line in order of height, from the shortest at the front to the tallest at the back, and no two have the same height. Tanu is 9th from the front and there are 16 students behind her. Three new students, each shorter than Tanu, join the line in their correct places. What is Tanu’s position from the back now?
Answer & explanation
Correct answer: option 3
The correct answer is Option (3) → 17th
Students shorter than Tanu stand in front of her, so the new students do not change the part of the line behind her.
Before: 16 students behind Tanu, so she is \(16+1=17\)th from the back
The three new students are shorter, so they all join in front of her
Students behind her are still 16, so she is still 17th from the back
(From the front she moves to \(9+3=12\)th.)
