Question

Total number of students in 4 different schools and percentage of students participating in Dance and play in 4 different classes:
Q. what is the sum of students who do not participate in dance and play from class VI and IX together?

• A. 720
• B. 480
• C. 620
• D. 580
• E. None of these

Answer 1

The correct option is D

580

Students who participate in dance and play from class VI
$=(500\times \left(\frac{15}{100}\right))+(500\times \left(\frac{8}{100}\right))=115$
Students who participate in dance and paly from class IX
$=(250\times \left(\frac{10}{100}\right))+(250\times \left(\frac{12}{100}\right))=55$
Students who do not participate in dance and play from class VI and IX together:
= (500-11)+(250-55)
= 580