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Answer

Total number of  pupils = 14 + 18 + 8 = 40

Total number of books borrowed = average books borrowed * total number of students

= 40 * 3 = 120

If missing number is u,

Total number of booked borrowed = 14 * 0 + 18 * 4 +  8u = 120

72 + 8u = 120

8u = 48

u = 6

The missing number is 6.

 

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