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1 February, 03:33

One winter night the temperature fell 13 degrees between midnight and 5 A. M. By 9 A. M. the temperature had doubled from what it was at 5 A. M. By noon, it had risen another 9 degrees to 29 degrees. What was the temperature at midnight?

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  1. 1 February, 04:24
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    23 degrees

    Step-by-step explanation:

    First, subtract 9 from 29 to find the temperature at 9 A. M. The temperature at 9 A. M. was 20 degrees. The temperature from 5 A. M. doubled to get to the temperature at 9 A. M., so divide 20 by 2. The temperature at 5 A. M. was 10 degrees. The temperature from midnight to 5 A. M. fell 13 degrees, so add 13 to get the temperature at midnight. 13+10=23. It was 23 degrees at midnight.
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