Elio makes candles that are 14cm. Each candle burns 8 hours before going out. He is wondering how many hours a 21 cm tall candle can burn for. He assumes that the relationship between the height of a candle and number of hours it burns (h), is proportional.

Question

Wolfe

Mathematics

15 June, 00:38

Elio makes candles that are 14cm. Each candle burns 8 hours before going out. He is wondering how many hours a 21 cm tall candle can burn for. He assumes that the relationship between the height of a candle and number of hours it burns (h), is proportional.

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Answers (1)

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Rowan Hays · Answer 1

Elio is right in assuming the relationship between the height and the hours it burns is proportional.

Find the unit rate

14 : 8 = 1.75 cm/h

Divide

21 : 1.75 = 12

You can set this up as an algebraic equation to check the answer.

If the candle is 21 cm tall, it will burn for 12 hours.