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?
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Answer:
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 40%.
