How to do this question?? I am confused it is a very simple question. Why IDK I can't do this.

How to do this question?? I am confused it is a very simple question. Why IDK I can't do this.
Homework....if so try to solve and tell us what your thinking.
I'll leave this tip though...many ways to solve it...but easiest probably think of each candle as a separate equation.
I also get an answer of 5 hours.
But I am suspecting that you have not quoted the question exactly/correctly  as it seems to be too 'simple' a question.
For example, here is a similar question:
7th Grade Math  The Candle Problem (Help!)?  Yahoo! Answers
which is more like the kind of question I would expect.
Could you recheck the question (or maybe post the question verbatim)?
The question is badly worded. "How much time is left for the 8 hour candle when the candle which burn in 6 hours is half its height?"
Do they mean the 6 hour candle is half its own original height, or that it is half the height of the 8 hour candle?
The answer is 5 for the first case, but is not 5 for the second case.
True but the answer for the second case isn't 4.8, either, so there's still something wrong. In the second case, 4.8 hours is the time the candles have burned, not the time left on the 8hour candle.
In 4.8 hours the 8 hour candle has burned down to (84.8)/8=3.2/8=0.4 of the original height, and the 6 hour candle is (64.8)/6=0.2. This is where the 6hour candle is half the remaining height of the 8hour candle.
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