In a school, 180 students are studying in the 9^th class. Among them, 35% are rich and others are poor. There are 80 girls in the class, of whom 65% are poor. How many rich boys are there in the class?

Correct option is B

Given:
Total students = 180
Rich students = 35% of total
Total girls = 80
Poor girls = 65% of total girls
Solution:
Calculate the total number of rich students:
Total rich = $$\frac{35}{100}$$​ × 180 = 63
Calculate the number of poor girls:
Poor girls =  $$\frac{65}{100}$$​ × 80 = 52
Calculate the number of rich girls:
Rich girls = Total girls - Poor girls
Rich girls = 80 - 52 = 28
Calculate the number of rich boys:
Rich boys = Total rich - Rich girls
Rich boys = 63 - 28 = 35
Final Answer
So the correct answer is (b)