The daily average rainfall on 5 days of a week is 30 mm. If the rainfall on 6th and 7th day are 42 mm and 25 mm respectively, then what is the average daily rainfall for the 7 days?
A.29.5
B.33
C.31✓ Correct
D.28.5
Explanation
Total rainfall for 7 days = 5×30 + 42 + 25 = 150 + 67 = 217 mm. Average = 217/7 = 31 mm.
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