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?

Carli has 90 apps on her phone. braylen has half the amount of apps as theiss. if carli has three timesthe amount of apps as theiss,how many apps does braylen have? let b represent the number of braylen's apps and t represent the number of theiss's apps.