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:

B=−29∘C G=B+5=(−29)+5=−24∘C L=G+20=(−24)+20=−4∘C

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