Question 1
In a class of 61 students, there are 38 boys and 23 girls. Riya ranks 20th from the top. There are 10 boys before her in the rank list. How many girls are after her rank (towards the bottom)?
Students before her: 19. Of these, boys before = 10, so girls before = 19 - 10 = 9. Girls after = total girls - girls before - herself = 23 - 9 - 1 = 13.