At a call centre in Chennai, the four ellipses show the staff who speak Hindi, English, Tamil and Telugu, and 34 of them speak English. The region marked ? holds those who speak English and Tamil but neither Hindi nor Telugu. What is that number?

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Accepted Answer

7. Every number inside the English ellipse adds up to 34: 9 + 5 + 2 + 3 + 1 + 5 + 2 + ? = 27 + ? = 34, so ? = 7. 9 forgets the centre 2 (all four languages), 5 counts that centre twice, and 27 is only the sum of the known parts.

At a call centre in Chennai, the four ellipses show the staff who speak Hindi, English, Tamil and Telugu, and 34 of them speak English. The region marked ? holds those who speak English and Tamil but neither Hindi nor Telugu. What is that number?

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