In 7 days of a week starting Monday, on an average 300 boys attended a camp for the first five days and 350 boys on an average attended for the last three days. The average attendance in this week is 325. What was number of students present on Friday?

In 7 days of a week starting Monday, on an average 300 boys attended a camp for the first five days and 350 boys on an average attended for the last three days. The average attendance in this week is 325. What was number of students present on Friday?
1). 660
2). 300
3). 325
4). 275

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