Question

A cake is removed from an oven at 210F and left to cool at room temperature, which is 70F.After 30 min the temperature of the cake is 140F. When will it be 100F?\

Answer 1

Answer: The cake would be 100F after about 47 minutes

Explanation:

Initial temperature = 210F

Time at 140F = 30 minutes

At 140F the cake has lost (210-140)F

= 70F

70F is lost on 30minutes

Rate of temperature reduction

= (70/30) F/min

= 7/3F/min

To lose 110F from 210 to 100F

Temp/time = 7/3

110/t = 7/3

Cross multiply

t = 330/7

t = 47.1429minutes ~ 47min