Brain Teasers
Candle Light Kebab
Mad Ade was studying for his Kebabology examinations at the University of MADADIA. He was doing some final revision before his morning exam, but alas there was a power cut. This was around 1:00 AM. Mad Ade managed to find two candles in the dark and lit them. The two candles were of equal length but one was much thicker than the other.
According to the box the candles were in the thick candle is supposed to last six hours and the thin one two hours less. When Mad Ade finally went to sleep, dreaming of kebabs, the thick candle was twice as long as the thin one.
For how long did Mad Ade study by candle light?
According to the box the candles were in the thick candle is supposed to last six hours and the thin one two hours less. When Mad Ade finally went to sleep, dreaming of kebabs, the thick candle was twice as long as the thin one.
For how long did Mad Ade study by candle light?
Answer
3hrs.Say the length of the candle is 1 unit. After 1 hr the thick candle will be 5/6 of one unit, the thin candle 3/4. After two hrs the thick candle will be 2/3 (4/6) the size and then thin 1/2 (2/4). After 3hrs the thick candle will be 1/2 (3/6) and the thin 1/4. As 2* 1/4 = 1/2. The answer is 3hrs.
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Comments
If there's one bad Candle kebab teaser, I haven't heard it!
This is clever - a variation on rate of change problems, but I'm amazed you can crank out so many of these. Is this a profession?
Nice one!
Say candles are 12 cm in length
Thick candles burns at 2 cm/hour
Thin candle burns at 3 cm/hr
After x hours (12 – 2x) = 2(12 – 3x)
4x = 12 x = 3 hours
Nice Teaser!
Thick candles burns at 2 cm/hour
Thin candle burns at 3 cm/hr
After x hours (12 – 2x) = 2(12 – 3x)
4x = 12 x = 3 hours
Nice Teaser!
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