Ground level

The temperature at ground level in Helsinki is 20°C lower than in London. The temperature in a basement flat in Helsinki is 5°C below the temperature at ground level. If it is -29°c in the basement, what is the temperature in London?

Correct answer:

L =  -4 °C

Step-by-step explanation:

$$\begin{gathered} B=-29\text{ °C } \\ G=B+5=(-29)+5=-24\text{ °C } \\ L=G+20=(-24)+20=-4\text{°C} \end{gathered}$$

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