If the average daily high temperature for the week was 28C, find the missing temperature from the following list:  25C, 26C, 31C, 30C, 29C, 24C, ?C

Explanation

Cumulative offset from average 28C needs to be zero.  -3 -2 +3 +2 +1 -4 = -3 ==> missing temperature needs to add +3, and 31C does that

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