The average temperature for Monday, Tuesday and Wednesday was 40C. The average for Tuesday, Wednesday and Thursday was 41 C. If on Thursday temperature is 45C, what was it on Monday ?
Total temperature for Monday, Tuesday, Wednesday and Thursday = 40 x 3 + 45 = 165 C
Total for Tuesday, Wednesday and Thursday = 41 x 3 = 123 C
So,
Temperature for Monday = 165 - 123 = 42 C
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