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 result:

L =  -4 °C

Solution:

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

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