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17 September, 17:50

The smallest candle has a radius of 0.5 inches and a height of 3 inches. The other two candles are scaled versions of the smallest, with scale factors of 2 and 3. How much wax is needed to create one set of candles?

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  1. 17 September, 21:42
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    Volume of smallest candle = pi r^2 h = pi*0.5^2 * 3 = 2.356 ins^3

    volume of candle with scale factor 2 = 2.356 * 2^3 = 18.848

    ... 3 = 2.356 * 3^3 = 63.612

    Total volume of wax needed = 2.356 + 18,848 + 63.612 = 84.816

    Answer is 84.82 ins^3 of wax to the nearest hundredth.
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