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IQ Brain Teaser #75
A candle is lit, and after 10 minutes, it is also lit at the other end. 20 minutes later, the candle is completely melted. If the candle were lit at both ends to begin with, and then one end were extinguished when only half of the candle remained, how long in total would it take for the candle to completely melt?
32.5 minutes
35 minutes
37.5 minutes
40 minutes
42.5 minutes
45 minutes
47.5 minutes
50 minutes
52.5 minutes
None of the above

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