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The temperature in a chemical plant was -5oC at 2.00 am. The temperature fell by...

Mathematics
WAEC 2006
The temperature in a chemical plant was -5oC at 2.00 am. The temperature fell by 6oC and then rose again by 7oC. What was the final temperature?
  • A. -6oC
  • B. -4oC
  • C. 4oC
  • D. 8oC
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Correct Answer: Option B
Explanation
Temperature = -5oC

It fell by 6oC = -5oC - 6oC

= -11oC

Then rose by 7oC = -11 + 7

= -4oC (final temperature)
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