From midnight to 1:00am in January the temperature dropped 19 F. After drooped, the outside temp was - 20 f. What was the temperature a midnight?

Let's call the midnight temperature ' T '. (Clever?)

After the temperature drooped 19 degrees, it must have been (T - 19).

But we know that it was - 20 after it drooped 19 degrees, so we can say

T - 19 = - 20

Add 19 to each side of the equation, and then it says:

T = - 1.

See that? The answer just about jumped out at you!

I am pretty sure it is - 1 f ...