Question

The cost of a candle varies directly with the volume of the candle. If a candle with a volume of 80 cm³ costs $12, what would be the cost of a candle with a volume of 120 cm³?

Answer 1

The cost of a candle with a volume of 120 cm³ is:

$18

Explanation:

We are given that

A candle with a volume of 80 cm³ costs $12

and the cost of a candle varies directly with the volume of the candle

cost of 80 cm³ of candle= $12

so, the cost of 1 cm³ of candle= $ 12/80

Hence, cost of 120³ of candle= $ 12×120/80

= $ 18

Hence, the cost of a candle with a volume of 120 cm³ equals:

$18

Answer 2

If c represents that cost, then
.. 12/80 = c/120
.. c = 120*(12/80) = 18

The cost of the larger candle is $18.