1.

The average temperature of the first three days is 27°C, and that of the next three days is 29° C, if the average of the entire week is 28.5°C, then the temperature of the last day is_1). 31.5°C2). 10.5°C3). 42°C4). 36°C

Answer»

AVERAGE = Sum of quantities/Total number of quantities

Given, average temperature of the first three days is 27°C, and that of the next three days is 29° C.

Sum of temperatures for first SIX days = 27 × 3 + 29 × 3 = 168° C.

Let the temperature on the last day be ‘t’.

Thus average temperature of the WEEK $(= \frac{{168 + t}}{7})$

Given, average of the entire week is 28.5°C.

$(\therefore \frac{{168 + t}}{7} = 28.5)$

⇒ 168 + t = 199.5

⇒ t = 31.5° C


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