Question


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|
Age (in years)
|
0-10
|
10-20
|
20-30
|
30-40
|
40-50
|
|
Number of persons
|
5
|
25
|
?
|
18
|
7
|


|
Number of letters
|
1-4
|
4-7
|
7-10
|
10-13
|
13-16
|
16-19
|
|
Number surnames
|
6
|
30
|
40
|
16
|
4
|
4
|