Temperature variations

Today's temperature was 80 degrees, and then the temperature dropped 10 degrees. Then it dropped 15 degrees again, then the next day, the temperature went up 2 degrees.

What would the temperature be?

Correct result:

t =  57 °F

Solution:

t=80−10−15+2=57∘Ft=80 - 10 - 15 + 2=57 ^\circ \text{F}

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