or
A pet store owner had his staff count the number of fish in each tank.

0-9
10-19
20-29
30-39
40-49
50-59
60-69
70-79
0
1
2
3
4
5
6
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8
Number of tanks
Number of fish
Fish per tank


How many tanks are there in all?

tanks
ref_doc_title.

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