The following table shows the total number of students in four different classes of a school, and the percentages of students participating in Music or Plays from each of these four different classes. NO student participates both in Music and in Plays.
|
Classes |
Total number of |
Percentage of participants |
|
|
Music |
Plays |
||
|
X |
600 |
12 |
8 |
|
IX |
400 |
10 |
6 |
|
VIII |
280 |
30 |
15 |
|
VIII |
250 |
10 |
12 |
What is the total number of students who do NOT participate in Music or Plays from classes X and VII, taken together?
Answer & explanation
Correct answer: option 4
Total number of students in X = 600
Number of students who are not in music or play in X =600 - \(\frac{12+8 }{100}\) × 600
= 480
Total number of students in VII = 250
Number of students who are not in music or play in VII = 250 - \(\frac{10+12 }{100}\) × 250
= 195
Total number of students who do not participate in music or play from X & VII = 480 + 195
= 675