Maria is on the 23rd position from the starting and on 37th position from the end in his class. He is on 18th position from the starting and on 23rd position from the end among the students who passed. How many students failed?
19
Total no. of students = [Maria's place from starting + Maria's place from end] -1
= [23 + 37] - 1 = 59
No. of students who passed
= [Maria's place from starting + Maria's place from end] -1
= [18 + 23] - 1 = 40
∴ Number failed students = 59 - 40 = 19