Question

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

Answer 1

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