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What time was the observation made? POW#14?

Can someone please help me with this homework question?: Una recently purchased two boxes of ten-inch candles - one box from a discount and the other from an expensive boutique. One evening, Una noticed that the inexpensive candles last only three hours each, while the expensive candles last five hours each. The next evening, Una hosted a dinner party and lit two candles - one form each box - at 7:30 pm. During dessert, a guest noticed that one candle was twice as long as the other. At what time was this observation made? If you do answer this please give exact answer and an explanation to go along with it. Pleas and Thank You!

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1. How tall is the expensive candle after x hours? 10 - (10/5)x How tall is the cheap candle? 10-(10/3)x When is the expensive candle twice the height of the cheap one? 2(10 - (10/3)x) = 10-(10/5)x Add that to 7:30