41. The average attendance of a college for the first three days of a week is 325 and for the first four days it is 320. How many were present on the 4th day? (b) 310 (C) 308 (d) 305 (a) 315
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the average attendance of a school for the first three days of a week is 325 and for the first four days is 320 how many were present on the 4th ...
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