The temperature went up 5 degrees Celsius and then down 1 degree Celsius, ending up at a final temperature of –4 degrees Celsius. What was the starting temperature?
Question
The temperature went up 5 degrees Celsius and then down 1 degree Celsius, ending up at a final temperature of –4 degrees Celsius. What was the starting temperature?
Solution
To find the starting temperature, we need to reverse the changes that were made.
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First, reverse the last change: the temperature went down 1 degree Celsius to end at -4 degrees Celsius. So, before it went down, it must have been at -4 + 1 = -3 degrees Celsius.
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Then, reverse the first change: the temperature went up 5 degrees Celsius to reach -3 degrees Celsius. So, the starting temperature must have been -3 - 5 = -8 degrees Celsius.
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