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?

Assessment: WAEC SSCE - General Mathematics - 2006 (Objective) Subject: General Mathematics

Question 1 Report

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?
Answer Details
The temperature in the chemical plant was -5oC at 2.00 am. The temperature fell by 6oC, so the temperature became (-5 - 6) = -11oC. The temperature then rose by 7oC, which means the temperature increased from -11oC to (-11 + 7) = -4oC. Therefore, the final temperature was -4oC. Hence, the correct option is (-4oC).

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