Question

Using the same survey data from the earlier questions: in May 2007, with the same group of students, all of them read India Today, 120 read Outlook, and none read Business India.

How many students read only India Today?

• A. 60
• B. 110
• C. 230
• D. None of these

Hint:

Since every student reads India Today in May 2007, only-India-Today readers equal total students minus Outlook readers.

Answer 1

The Correct Option is C

In May 2007 the picture becomes much simpler than the three magazine survey from before. Every one of the 350 students now reads India Today, so the India Today circle stretches over the whole group. Business India drops out completely since nobody reads it, leaving just India Today and Outlook to sort out.

1. Whole group reads India Today: this means India Today itself equals the full 350 students.
2. Outlook readers: 120 students also pick up Outlook. Since Business India is out of the picture, these 120 must sit inside the India Today circle too, there is nowhere else for them to be.
3. Only India Today readers: these are the students left over once the Outlook overlap is removed from the full group of 350.

So only India Today readers = 350 - 120 = 230.

Let's summarize:

• When "all" read a magazine, that magazine's circle becomes the entire surveyed population.
• "Only that magazine" then just means subtracting every other magazine's readers from the total.

230 students read only India Today in May 2007, which corresponds to option (C).