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7 5. A group of students calculated their average collection for charity. They discovered that if one of them collected [tex]$200 more, their average collection would be $[/tex]240. If one of them collected [tex]$340 less, their average collection would be $[/tex]180. How many students were there in the group? (1) 13 (2) 9 (3) 5 (4) 4 ( )
Sagot :
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