# Daily average

Calculate the average temperature during the day, when 15 hours was 20 °C and 9 hours was 13 °C.

Correct result:

t =  17.4 °C

#### Solution:

$t=\frac{20\cdot 15+13\cdot 9}{15+9}=17.{4}^{\circ }\text{C}$

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