Homework SourseA loaf of bread is removed from an oven at 350 degrees F and
A loaf of bread is removed from an oven at 350 degrees F and cooled in a room whose temperature is 70 degrees F. If the bread cools to 210 degrees F in 20 minutes, how much longer will it take the bread to cool to 155 degrees F. Round to the nearest minute.
a) 15
b) 34
c) 24
d) 14
show work to get a good rating
a) 15
b) 34
c) 24
d) 14
show work to get a good rating
Solution
Obviously 350 degF was intended. 70degF is your ambient temperature to which the bread eventually will cool. What is of interest are the delta temperatures. Starting delta: 350-70 = 280degF First delta: 210-70 = 140degF % cooled in 20 minutes: 140/180 = 0.5 = 50% Second delta: 160-70 = 90degF %cooled: 90/180 = 0.5 = 50%
