Thermometer

The thermometer showed -3°C at morning. Then temperature was increased by 1°C again increased by 1°C and then decreased by 1°C and then decreased by 4°C.

Which terminal temperature thermometer shows?

Correct result:

t =  -6 °C

Solution:

$t=-3+1+1-1-4=-6^{\circ }\text{C}$

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