Question

Lisa lit a candle with a height of 8 inches. When lit, this candle loses 10% of its original

height every hour.

Answer 1

• 1.25 hours or 1 hour and 15 minutes

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