Rinki is ranked 10th from the top and 28th from the bottom in a class. How many students are there in the class?
Answer & explanation
Correct answer: option 2
The correct answer is Option (2) → 37
Rinki's place is known from both ends, so the class is made up of the students above her, Rinki herself and the students below her.
Students above her \(=10-1=9\)
Students below her \(=28-1=27\)
Total \(=9+1+27=37\)
Tip: Total = rank from the top + rank from the bottom − 1. The 1 is taken away because Rinki is counted in both ranks; adding the two ranks alone gives 38, one of the options.