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Answer :
Answer:
- 1.25 hours or 1 hour and 15 minutes
Step-by-step explanation:
Question
- Lisa lit a candle with a height of 8 inches. When lit, this candle loses 10% of its original height every hour.
- Please complete the following sentence by writing the number in the blank.
Until the candle has been burning for at least _______ hours, the height of Jennifer's candle will be more than 7 inches.
Candle looses 10% of 8 inches, it equals:
- 8*0.1 = 0.8 inches an hour
Let x be required time, then:
- 8 - 0.8x > 7
- 0.8x < 8 - 7
- 0.8x < 1
- x < 1/0.8
- x < 1.25
- or 1 hour 15 minutes
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