Question
In a survey conducted in a locality, it was found that
50% read newspaper A, 40% read newspaper B, and 20% read neither A nor B. If the number of persons who read both A and B is 500, then how many persons were surveyed?Solution
Percentage of persons who do not read newspaper A = 100% - 50% = 50% Percentage of persons who do not read newspaper B = 100% - 40% = 60% Percentage of persons who don't read any newspaper neither A nor B = 20% From the following chart. Total percentage who read both A and B newspaper = 100% - 30%-20%-40% = 10% Let the total number of people be x, then x × (10/100) = 500 x = 500 x 10 = 5000 The total number of persons are 5000.
The cardinality property of a relation, refers to the
Which key is used to refresh a webpage?
In database terminology, what is a 'primary key'?
Macintosh is designed and developed by
Which one of the following layer is called as User friendly layer?
A Compiler is software which converts
The process of verifying that someone is who they claim to be is called:
What is the primary difference between "RAM" and "ROM"?
Which topology uses a central hub?
Which of the following shortcut keys is used to make the contents of a cell underlined in MS Excel 365?