Vicky records the low temperature for three consecutive days. Between the first and second days the temperature increased 6 degrees. Between the second and third days the temperature decreased 3 degrees. On the third day the low temperature was –6º. What was the low temperature on the first day?

Let the first day’s temperature be x. The second day was x + 6, and the third day was 3 degrees less than that, so it was x + 3. Since the third day’s temperature was −6 degrees, x + 3 = −6, giving x = −9. The first day’s low temperature was −9 degrees, choice B.

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