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Mathematics
Problem
In an office of 20 people there are only 4 salary levels paid:
100
000
100\,000
100
000
(1 person),
84
000
84\,000
84
000
(3 people),
70
000
70\,000
70
000
(6 people),
56
000
56\,000
56
000
(10 people)
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