At midnight, a thermometer read -4 ℃. At 3 a.m the temperature had fallen by 5 ℃. By midday, it had risen by 12 ℃ from the 3 a.m temperature.
What was the reading on the thermometer at midday?
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Step-by-step explanation:
Reading of the thermometer at midday
= (-4 -5 + 12)°C = 3°C
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