At midnight the temperature was 21°c. Two hours later it was 3° colder. What was the temperature then
Since the temperature is high if it hot and after those 2 hours temperature was colder by 3 °C then 21 - 3 = 18°C at that time
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To find the temperature two hours later, we need to subtract 3 degrees from the initial temperature of 21°C.
Subtracting 3 from 21 gives us: 21 - 3 = 18.
Therefore, two hours later, the temperature was 18°C.