Two drops

Between 5:00 pm to 6:00 pm, the temperature dropped 3°C. Between 6:00 pm to 7:00 pm, the temperature dropped 4°C. What was the total drop in temperature from 5:00 pm to 7:00 pm?

Correct answer:

Δ =  7 °C

Step-by-step explanation:

Δ1=3 °C Δ2=4 °C  Δ=Δ1+Δ2=3+4=7°C

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