The temperature at 7 a.m. was -11°C. The temperature increased by 9°C during the day and then decreased by 4°C at 8 p.m. Which was the temperature at 8 p.m.?
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temperature at 7 am---> -11°C
during day---> increased by 9degree
= -11+9 = -2°C
at 8pm----> decrease by 4
= -2-4= -6°C
temperature at 8 p.m. was -6°C
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