The average attendance of a college for the first three days of a week is 325 and first four days is 320. How many were present on the fourth day?

The average attendance of a college for the first three days of a week is 325 and first four days is 320. How many were present on the fourth day? Correct Answer 305

4th days attendance = (320×4 - 325×3)                           = 1280 - 975 = 305 Ans. 
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