The temperature

The temperature at 1:00 was 10 F. Between 1:00 and 2:00, the temperature dropped 15F. Between 2:00 and 3:00, the temperature rose 3F. What is the temperature at 3:00?

Correct result:

t =  -2 °F

Solution:

$t=10-15+3=-{2}^{\circ }\text{F}$

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