Jenny wants to heat a dish for dinner.  It needs to be at 100 degrees before it is ready to eat.  It is 20 degrees when she places it in the oven, and it heats up 5 degrees every minute.  How many minutes will it take to be ready?
To determine this, we must first figure out the required change in temperature. To do this, we perform 100-20= <<100-20=80>>80 degrees of required temperature change.
Next, we divide this amount by the rate of change per minute, performing 80/5= <<80/5=16>>16 minutes of cooking time.
#### 16