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1 November, 10:12

The mean temperature for the first 4 days in January was 1°C.

The mean temperature for the first 5 days in January was 3°C.

What was the temperature on the 5th day?

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  1. 1 November, 13:32
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    11°C because 1+1+1+1=4. 4/4=1.

    So you do 3x5=15 which is how much the temperatures over the five days will add up to and then do 15-4 = 11°
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