In a class 20% of students wore glasses, 30% wore contact lenses, and 10% wore both glasses and contact lenses. What percentage of students in the class wear elder glasses or contact lenses?
- 20%
- 30%
- 40%
- 60%
Explanation
Given:
- Percentage of students who wore glasses: 20%
- Percentage of students who wore contact lenses: 30%
- Percentage of students who wore both glasses and contact lenses: 10%
Let's denote:
-A : Set of students who wore glasses
-B : Set of students who wore contact lenses
The formula for the union of two sets is given by:
Substitute the given values:
P(students who wear glasses or contact lenses) = 20% + 30% - 10% = 40%
Related MCQs
- P = 1400(1.06)ᵗ
- P = 1400(0.94)ᵗ
- P = 1400 − 6t
- None of these
اس سوال کو وضاحت کے ساتھ پڑھیں
- 20%
- 25%
- 30%
- None of these
اس سوال کو وضاحت کے ساتھ پڑھیں
- 120
- 140
- 150
- None of these
اس سوال کو وضاحت کے ساتھ پڑھیں
- 24,200
- 22,000
- 23,000
- None of these
اس سوال کو وضاحت کے ساتھ پڑھیں
