Thanks Jhevon,

Yeah, the normal body temperature is 37. I just asked my teacher about it.

another two practical problems would have help me a lot. Moving to chemical problem.

1. A compound C is formed when two chemicals A & B are combined. The resulting reaction between the two is such that for each gram of B, 3 grams of A are used. Initially there are 36 grams of A and 18 grams of B. It's observed that 10 grams of the compound C are formed in 15 minutes. Determine the amount of C at any time if the rate of the reaction is proportional to the amounts of A & B remaining. Find the amount after 20 minutes.

2. Another newton's cooling problem.

On Easter, a ham is removed from an oven and placed in a room where the temperature is 70 degree F. A meat thermometer indicates that internal temperature of the ham to be 220 degree F. 30 minutes later, the meat thermometer indicates 200 degree F. How much longer it will take to cool the meat to 100 degree F.

3. Grow and Decay

The wood of an Egyptian sarcophagus (burial case) is found to contain 63% of the Carbon-14 found in a present-day sample. What is the age of the sarcophagus if the half-life of C14 is 5730 years ?

again, thanks Jhevon....I appriciate that.